Okay, I don't claim to be the best. I've had my fair share of really terrible defeats, but I get first place around 40% of the time, and no, I don't whore for points with reviving people...
 
But here are my "credentials" :

• Sit close to your screen. 
• Keep the volume loud enough to hear footsteps and C4 beeps.
• Watch the ground for mines whenever driving. When in doubt, spot them, if they show up on the radar, they're enemy mines.
• When suspicious of enemies in a room, throw a grenade through the window, if you here "LOOK OUT! GRENADE!" You know you've got baddies. 
• After killing an enemy, keep an ear out for "Man Down!", this is a sign that you're about to be jumped. 
• Set the enemy VO to localized in the options, it'll make the Russians speak in accented English, even if they're not on your team.
• Think before spawning on squad mates.
• When on a cold streak, change up your approach or strategy, even if it doesn't seem best.
• Set the ground vehicle controls to BC1 style, using the left trigger as the gas may seem strange, but after 5 minutes you'll get over it, and have better access to your cannons, even when reversing.
• Remember, tanks take 2x damage to the sides and back, and 1.2x damage if those sides are hit from an angle. Use this knowledge when attacking other tanks, and use it to keep yourself alive by always squaring off.
• Remember the option to man the turret of your tank when dealing with foot soldiers, it may be better than manning the tank cannon.
• Try all the weapons, having all the options you can get is best.
• Use all the kits until you're proficient. If you're stubborn enough to play only one class, or just plain don't like one of them, you're making a huge mistake. Having a favorite isn't a problem, though.
  
• Carl Gustav is good for helicopters and soldiers. RPG is good for armor on smaller maps. AT4 is good for armor on larger maps. Also, yes, your hunch is right, the Carl Gustav does less damage.
  
• Spread out your mines and place them on the crests of hills, near wreckage, and in shadows.
• You can climb through double windows if you slash the center bar with your knife.
• Keep your crosshair where you expect to see enemies.
• Stop sprinting when rounding corners, the time it takes to pull up your gun can kill you. Best way to cancel a sprint it lightly hit the aim button.
• Use reload canceling on bolt action sniper rifles, LMGs, and grenade launchers (switch away and back to weapon when the ammo counter says the ammo is replenished)
• It's better to just bring extra rocket ammo for your Carl Gustav than try to hit Black Hawks with tracer darts. They fly at about the same speed, so if you were lucky enough to tag a heli, you could have already killed it.
• Personal recommendation to use the BC1 style soldier buttons, knives in this game aren't really used in sudden situations, but pulling out pistols quickly is important.
• When disarming a crate, you can still aim, shoot, and reload. It requires you to aim with your left thumb, though... which may be easy for me cause I've got giant hands... so... yeah...
  
• Something I realized this week: If you get into a situation where you're being chased or chasing an enemy, and the line is broken through a door way, do not attack, let the enemy approach you through the door. In other words, door ways are really dangerous.
• If your team is really getting hammered on offense, using smoke grenades in abundance can really turn the tide.
• Learn to play without red dot or ACOG scopes, just plain old iron sites. Becoming proficient with plain iron sites will let you use other perks like faster sprint and extra grenades (great for assault). And when you do need those sites, their advantages become much more effective.
• When doing very long distance sniping, the real only choice is the plain M24. The GOL has no notches, the M95 is slow, loud, and has hard to read notches, and is slightly less accurate to boot.
• Do not doubt the utility of the 40mm shotgun.
• When doing the dangerous stairwell climb, look forward first, then backwards. Through the months it seems people have realized that the behind-the-stairs hiding spot is no longer secret, and as a result tend to stand at the top of the stairs, cause people tend to look backwards all the time.
• Shooting at walls with 40mm grenades and rockets is a great way to kill those on the other side.
• Do the opposite of what your enemy expects in those weird whack-a-mole situations.
• The M14 can be a great alternative to Engineer's guns for larger maps.
• The accuracy perk can be more useful than the magnum ammo perk. Magnum, for instance, makes the shots to kill for the AN-94 at long distance from 5 shots to 4 shots (to body), which is crap when half of your bullets miss.
• Reload when you get the chance, I find is insane when I see people on videos and such killing a person, and then running off with only 12 bullets in their XM8 clip or something.
• Experiment with the pistols. I personally prefer the Grach, having 17 somewhat powerful shots is great when you pull the trigger fast. And the sight is clean, and has good long distance plunking ability.
• Apparently the magnum ammo perk for sniper rifles decreases their range, so keep that in mind when doing very long distance sniping.
• SPOT ALWAYS
• Keep an eye out for UAVs
• The knife isn't all that reliable, save it for snipers and campers. Going toe to toe with a knife ends with a bullet in your face 90% of the time.
  

Seems like a really good list, I would just like to add further emphasis to the "SPOT ALWAYS"...not enough people do it and it can really change the way the game is played.

I tired that site and their stat tracker does not seem that good. That Or I am much better then I recall. 

take tips from someone who misses 79% of their shots? i think not.

" take tips from someone who misses 79% of their shots? i think not. "

" @Ryax said:

" take tips from someone who misses 79% of their shots? i think not. "

    What about me?  "

" @The_Laughing_Man said:

" @Ryax said:

" take tips from someone who misses 79% of their shots? i think not. "

    What about me?  "

especially not you! never ever would i listen to a thing you said about anything ever "

" @Ryax said:

" @The_Laughing_Man said:

" @Ryax said:

" take tips from someone who misses 79% of their shots? i think not. "

    What about me?  "

especially not you! never ever would i listen to a thing you said about anything ever "

But I play to help others! Without them being alive we lose!  "

When using the UAV, flying low to the ground and darting in and out of cover is a great way to maneuver around the battlefield. Plus, it's not often expected as most UAV's just hover high above the battlefield and rain down missiles. Just remember that your main objective as the UAV is to spot everything and take out turrets.
 
Oh, when playing Engineer on a map that pits you against tanks and other armor, use fucking mines. I feel like me and a few dozen other people use the mines. They stay after you've died, and you drop like five at a time. You can make getting a tank to the MCOMs a nightmare for the other team.
 
Also, if you're an Engineer with rockets, destroy enemy turrets with those rockets. If you find yourself walking towards the enemy base with little to shoot at, but there are turrets in your line of sight, just take them out. Learn the maps and learn the key locations of particularly devastating turrets. Get rid of them.
 
Finally, if you're rolling Soldier, drop ammo packs. Seems that far too many people still neglect to do so.

Right below your point about shooting smoke grenades, you should add one suggesting that if you see your teammate shooting smoke grenades, you should rush, using the smoke for cover.  You'd be surprised how often I'm covering the entire playing field in smoke and my whole team is just sitting back.
 
Also, there's a bug where sometimes aiming through smoke will make it disappear.
 
Don't spawn next to a sniper (or anybody really) and then immediately start firing full-auto or shooting off rockets.  You're probably not going to kill anything and will only get you and your squadmate spotted, and piss off your team.
 
When playing Rush as the attacking team you should ATTACK THE OBJECTIVE.  When playing Rush as the defending team you should DEFEND THE OBJECTIVE.
 
That's it for now, but I'll probably be back.

Use reload cancelling on practically everything, especially RPGs. It's actually ready to fire much sooner than it lets you aim down the sights without reload cancelling.
 
Good tip on spotting the enemy mines. I knew you shouted about them when destroying one, but I could never tell if they were friendly or enemy. (Also, how fucked up is it that you don't get points for blowing up enemy explosives??)
 
Using extra explosive damage with Carl against helicopters should even take out armored choppers.
 
The tracer dart was updated weeks ago. It actually flies 166% faster than Carl (or, for a different frame of reference, exactly 1/3 the speed of bullets). Use it.
 
Strafe right and hit back/select (or just hit socialize on PC at any time) so you can fire AND spot simultaneously. Even if you go down shooting, your teammates will know where the enemy is.
 
The bolt actions all do comparable damage since the patch (the M95 does a measly 5 more than the others). The SV98 shoots the fastest, reloads the fastest, and has the largest magazine. If you don't mind the sights or use an ACOG like I do, it's your best bet. The M24 is runner up.
 
The M95 does some damage to lightly armored vehicles, including helicopters.
 
I actually find the G3 to be a fantastic engineer weapon, but it should almost never be fired full auto.
 
I haven't heard any information about magnum decreases any gun's range (all gun's bullets go to infinity). Magnum should only increase the distance a gun does its maximum damage. Still, it's not that useful for sniping unless the whole other team is wearing body armor (or if you're using the SVU).
 
The semi-automatics (M14, M1, T88 S, SVU) are basically clones of each other.  However, the SVU has the biggest range, 10 extra rounds in reserve (at least as compared to the T88, but I think the others too), and is silenced to boot. Add magnum ammo and it's a 3 shot kill against any unarmored target at any range. I also like to use an ACOG scope.
 
The pump action shotguns are basically clones. The NS 2000 reloads the fastest (so use that one), followed by the M870, with the SPAS bringing in the rear.
 
The semi automatic shotguns are basically clones. The SAIGA reloads the fastest. Use it.
 
The pump action shotguns with slugs are basically the same as the bolt action rifles without scopes.
 
The semi automatic shotguns with slugs are basically the same as the semi automatic rifles (M14, M1, T88 S, SVU).
 
AT mines are golden for destroying MCOM stations. Like C4, you can drop a maximum of 6 at a time, but unlike C4 they don't disappear when you die. That means even if you die in the middle of placing them, you can still come back later to blow them up, and there isn't a damn thing the defenders can do about it. Obviously, watch out for engineers near your MCOMs on defense.
 
The AT4's damage was lowered with the last patch. It now does the same damage as the RPG 7.
 
PICK UP DEAD ENEMY AND FIENDLY KITS. Recon dies near you? Swap to him for a second and chuck a motion mine. Assault dies near you? Drop an ammo pack for yourself.
 
AMMO PACKS AND MED PACKS STACK. The more you are standing on, the faster your ammo replenishes and your character heals. Don't not drop an ammo pack just because "there's already one there."

Don't suck.  
 
Hope I helped.

• When disarming a crate keep moving back and forth so snipers can't snag an easy headshot.
• When looking long distances, even if you don't see anything, still hit the "spot" button. At long range you can tag multiple snipers.
• When playing as engineer, use the launchers to look long distances. They have a slight zoom plus they're probably your best long range weapon. Counter-sniping with rockets is a lot of fun and very satisfying. :)
  
• When playing as a sniper, using motion mines isn't always the best idea. If you're hunting someone, you don't want them to know you're coming for them.
• Vice versa, if you hear the beep of being in a motion mine, either stand still or find a bush to hide in and then stand still, and take people out as they come for you.
• When sneaking through an enemy base, killing people isn't always the best idea. You make noise, plus within 15 seconds they'll be back, hunting you. I've passed inches behind enemies without killing them so that I could C4 the crate.
• As defenders, once you lose a base, try and hide somewhere so you can steal the attackers' vehicles when they spawn.
• Vice versa, as attackers, always be sure to clear out a newly captured base. Otherwise, you'll get spawn-killed and have your vehicles stolen.
  
• If the attackers dump one of their vehicles in your base, even a crappy car, don't destroy it. The longer it's in your base, the longer they can't use it.
  
• If you can learn the timing, cross the "out of bounds" area before technically allowed when attacking. In a vehicle, crossing 8-10 seconds early can get you in the enemy base before they realize.
• Remember that you are a mobile spawn point, so sometimes just bedding down somewhere safe in the enemy base can help your squad, especially if you're communicating.
• On Port Valdez (Rush), at the Harbor (3rd base), man the TOW missile that looks down the road. You can spot infantry as they come and you can eliminate the car and two tanks pretty easily. This can really turn the battle either way.
• When a bomb is planted, don't always go rushing to it. Leaving one crate completely unguarded just means you'll end up with two bombs to diffuse.
• Attacking up stairs when a house is occupied by enemies is often like stepping into a meat grinder. If you're equipped for it (extra explosives and C4), just blow out the first story and bring the house down on them. This is incredibly satisfying after getting spawn sniped by a bitch sniper hiding in your base. I suggest following it up by jumping up and down on the rubble. :)
• If you can think fast enough, grabbing the kit of an enemy you just killed can be quicker than reloading if you're in a bind. Plus, it feels badass. :)
• At close range, especially with pistols, don't use the iron sights. You aim too slowly to track someone effectively. As far as pistols go, I prefer the M1911 hands down. I feel just about as comfortable rounding a corner with that as I do with a full-auto LMG.
• When you and an enemy are opposite each other behind cover, the best way to surprise them is to go over the top, such as a flaming vehicle or a boulder.
• When sniping, unless you have a good hiding spot, search for targets and line up your shot as best you can while moving, and stop just before pulling the trigger. This makes it much harder to be counter-sniped.
  
• When sniping, fast-swapping to a pistol after hitting someone with your bolt-action can earn you a quick kill, even at long range.
• When reloading, double-tapping the button will cancel a reload if you come across another enemy.
• Try your best to prioritize targets. Kill the person looking your direction before the person facing away. Kill the person defusing the bomb before the guy standing 10 yards away. Always try and kill medics first because killing a whole squad only to leave a medic alive is pointless.
• Like others have said, USE ROCKETS ON THE CRATES. Honestly, if everyone did this, you might almost never lose.

" When playing a medic, if you see a guy get mowed down near you, don't revive him immediately. Try to look for his killer first. I've seen so many times where someone revives me, only to have the same guy kill me again and kill the medic as well."

On some rush games: It's far more simple to just destroy the building the mcom station is located in rather than storming the building itself. Too many dumbasses wasting attacker's tickets.

• When reloading, double-tapping the button will cancel a reload if you come across another enemy.

Whats the damage like on the top of  a tank?
 
Ive had situations where i've been on rooftops above an enemy tank, and ive shot down at it, just wondering if that was worth it or should I have snuck around to the back.

For the Assault class, I never choose the perks to have a larger capacity for ammo. To me, it matters very little when you can dump ammo crates.
 
For defense during Rush, when dealing with enemy tanks I tend to hammer them repeatedly with smoke grenades right in front of their line of sight.

" @FireBurger: I know for a fact that I've played in a match with you a few times on the opposing team and that you've killed me quite often. I think I'll invite you to my friends list so that I won't have to suffer that embarrassment again.  =) "

• Carl Gustav is good for helicopters and soldiers. RPG is good for armor on smaller maps. AT4 is good for armor on larger maps. Also, yes, your hunch is right, the Carl Gustav does less damage.
  
• It's better to just bring extra rocket ammo for your Carl Gustav than try to hit Black Hawks with tracer darts. They fly at about the same speed, so if you were lucky enough to tag a heli, you could have already killed it.
• When doing very long distance sniping, the real only choice is the plain M24. The GOL has no notches, the M95 is slow, loud, and has hard to read notches, and is slightly less accurate to boot.
• Apparently the magnum ammo perk for sniper rifles decreases their range, so keep that in mind when doing very long distance sniping.

 

" Whats the damage like on the top of  a tank?  Ive had situations where i've been on rooftops above an enemy tank, and ive shot down at it, just wondering if that was worth it or should I have snuck around to the back. "

On offense, focus heavily on flanking the defender's front line far PAST the MCOM stations. If you're the first man in, keep running from cover to cover, farther behind their lines. In essence, IGNORE the MCOM and keep on going. Let your squad mates spawn in on you and cause chaos behind their lines. This distraction, if done properly, will allow your less-valuable teammates to arm/C4 the MCOM into oblivion, while the enemy troops focus on you and your squad.

i dont know if someone said it but if a squad mate goes down and he is a medic and you are in behind enemy lines pick up his kit and revive him  

Does anyone know the stats for the armour perk for vehicles? I sometimes wonder if it works but other times I get hit and take no damage.

" @Tennmuerti:  Carl with the explosive damage spec should even take out armored helicopters, but if you're going the tracer dart route an RPG will work just fine.  The tracer darts actually travel 1/3 the speed of bullets now.  None of the sniper rifles have sway on consoles, so that's a non-issue for a lot of players. Not that you're wrong when commenting on PC.  What I have heard though is all bullets drop at -9.8m/s².  This should include the HMG rounds. I have no way to test it though. "

 
If you think you see an enemy, spam the "SPOT" button around the are until he appears. Also, using rockets to destroy MCOMM stations is a godsend.  
 
Tips for Rush: 
 
-Be in a good squad that actually talks, having a simple strategy can really help.
-When trying to arm an MCOMM station in the middle of an open area, use smoke grenades as cover. 
-If you die and your squad is in a undesirable position, try to switch to another squad if possible (this was not allowed in BF2) 
-M14 + handling improvements = perfect weapon for long range engineers. 
-Make sure you know how to use each kit! Don't stick to one. 
-Don't use magnum ammo if you're a sniper On hXc... use armour. 
- If you keep dying, change your strategy and take a deep breath... it's battlefield, you die a lot in this game. 
-COMMUNICATION IS KEY, I swear, every round that I've been in or played against a squad that used communication, I would do really well. 
-If you're trying to quickly rack up XP, don't play Squad deathmatch... you might get a lot of kills, but playing Rush will get you wayy more XP.

Well, I've only been playing for 2 days, but here's what I've learned so far:
 
-ALWAYS SPOT! It is incredibly helpful. If you're a beginner, getting used to doing this should be easy.
-Don't just rush blindly forwards, it will get you killed. Think, then move.
-Use cover. If you don't, you die.
-Stick with your squad. In almost all the games I've been in, I see people all over the place, doing their own thing (I may have done this myself the first couple of hours :-). Strength in numbers.
-Communicate with your team. If an attack is well coordinated, a round can be over in a matter of a few minutes.
-Don't just blindly spawn next to a squad mate. If he's under fire, there's a good chance you'll be caught in the crossfire when you spawn.
-If you're new, you will probably die a lot until you get used to the mechanics of the game and level up a bit. Just fight through it, it will get better. Of course, if you're like me, you'll still die a lot, but at least you get plenty of points :-)