Whether you agree with me or not, that will be your own prerogative.  However, I've seen so much bitching and complaining about the "cheapness" of Modern Warfare 2's multiplayer that I feel the need to comment on how pathetic some of the retort around here has been.  Therefore, consider this the official source of pointing out why you whine too much about stupid shit, and meanwhile, I'll also point out the shit that you SHOULD be whining about with Modern Warfare 2's multiplayer. 
 

Things You Need To Shut Up About

• "Noob tubes" - Grenade launchers happen.  When they do happen, you make sure to shoot those muthafuckers right in the face.  If you honestly can't kill them before the 1.5 second delay of their grenade leaving their rifle, then you needed to die because your ability to kill him failed.  Simple as that.  Moreover, never try to get pissed because some dood shot a grenade into your team while you were capping a base.  It's a viable weapon, and if you can't handle that...quit playing.
• "Campers" - So you keep going into Team Deathmatch, and you keep getting killed by people that sit in the same areas over and over and kill you when you are trying to run up a hill to kill them?  Then sir...quit playing TDM.  Go into Domination or Sabotage, because you know what?  In those match types, "camping" translates into "defense"...and you can't bitch about it anymore.  If you seriously have so much of an issue with camping, I would suggest loading up Unreal Tournament or Quake Live and leaving the world of Modern Warfare behind.
• "Knifers" - Guys that run around the map with Marathon Pro, Lightweight Pro, and Commando Pro knifing the shit out of folks are completely in the right.  As a matter of fact, if you could not shoot the muthafucker dead THAT WAS JUST GOING TO KNIFE YOU, then you REALLY deserved to die.  The ONLY time it is acceptable to bitch about this is when someone is using the Care Package grenade glitch.  THAT is bullshit.  Otherwise, dood...you got fucking knifed!
• "M16/M4A1/FAMAS" - Ah, you don't like the assault rifles that people are using?  Two of them are three round bursts that can kill if all three bullets hit the person?  Poor babies!  BOO FUCKIN' HOO!  You know what?  M16 and FAMAS take ACCURACY, and sure...the consoles have aim assist.  However, you STILL need accuracy with those guns.  If someone kills you with those, then take that as a lesson that someone else is far more accurate and attentive than you.  Meanwhile, the M4A1 is just fine.  It's a good assault rifle in real life, and so it will be in this game.  Moreover, the M16 doesn't unlock UNTIL LEVEL 40!!!  Therefore, by that point, you should have plenty of other weapons unlocked to counter it.
• "Sniping campers" - You keep getting killed by a sniper off in the distance all the time, so you have to bitch that he's camping the same point?  You know WHY he's camping that same point?  BECAUSE YOU KEEP FUCKING RUNNING OVER THERE!  He KNOWS you'll keep doing it.  Then you want to complain about the fact that he's not in the mix, running and gunning?  Well, that's the point of being a SNIPER!  They are distance-based killers
• "Scaffolding sitters" - Someone's sitting on top of a building in Highrise?  They're out on the crane?  KILL THEM!  Stop complaining about it and do something!  If you haven't sniped them down, then you are part of the reason they are still up there.  They are completely legit spots to sit, so quit complaining that people took more initiative than you.  This also means that the rest of your team has failed to stop them from getting in those spots as well, so try bitching at those folks more than you bitch at the people who are using those legit spots to rack up kills.
• "Helicopters & Harriers" - Stinger.  Set one kit up with it.  When a chopper or harrier shows up...kill it.  The AC130, Chopper Gunner, and Pave Low are tougher to kill, but it's not impossible.    If they are still in the air and chomping away at your team, then it just means you aren't taking the initiative necessary to PREVENT that.

Thing You Should Complain About 

• "Glitches" - This isn't just the Javelin glitch or the Care Package glitch.  I'm talking about guys that glitch under the stairs in Favela, into the rocks of Afghan, and all the other random places that have been found.  That is Infinity Ward's fault for not testing their maps enough, then going on to do nothing about those glitch spots with updates.
• "Akimbo Shotty" - Yes, the accuracy and range of Akimbo shotguns are broken as all Hell, and you have every reason to be pissed about that.  Blame the guys who got lazy and just copy/pasted the code for SMG Akimbos into the shotguns, thinking that the formula would work appropriately.  Nonetheless, you could kill them first (which I've done plenty of times), so it's something that CAN be beaten.  Unfortunately, it means YOU actually have to put effort out while they just point your general direction without any skill and just press two triggers.
• "Dolphin Divers" - Those guys are assholes.  Anyone who has to use the tactic of jumping/crouching in order to go horizontal in the air...needs to be sent to a gimp...and fucked repeatedly up the ass with a goddamn yucca plant!
• "Bunny Hoppers" - Battlefield 2 solved this issue by disallowing the ability to fire while you are jumping.  Infinity Ward should adopt the same thing.  The appropriate punishment for bunny hoppers should be the same applied to Dolphin Divers.
• "Nuke Boosting" - If you can't get this thing with a legit 25-kill streak, then you're a fuckwad and don't deserve it.  However, Infinity Ward was the one that dropped the ball on this...