There are hundreds of them so i cant list all of them.
My favorite though has to be the CoD series hands down, I had the best memories of any game in CoD2 with a clan. Good but hard times.

I vote Day of Defeat Source

I honestly dont care for any source based shooters, css was ok but it was just like the first cs with better graphics. Day of defeat seemed a bit slow for my tastes.

Counter-Strike: Source
TF2
Battlefield 2
Battlefield 2 is the best one

cod4

"I honestly dont care for any source based shooters, css was ok but it was just like the first cs with better graphics. Day of defeat seemed a bit slow for my tastes.
"

"Would probably have to say Call of Duty 4, although I spent a great deal too much time playing Battlefield: 2142 and Red Faction back in the day.
"

Goldeneye >_>

Call of Duty 4
Team Fortress 2

"Goldeneye >_>
"

Best MP shooter for me would have to be CS 1.6, although I hate that game nowadays.

The only shooter I have spent countless hours on for more than a few months is Counter-Strike (non source). There's no telling how many years I played that game for many hours a day.

Ive noticed that the people who stick to CS 1.6 are much more hardcore than the people who moved on to CSS :P

Has to be the Battlefield series for me. Counter-Strike never gave me much. Half-Life 2 with mods perhaps but the BF series are the best at that.

Halo 2.

Battlefield 2 or gears of war

I remember there was one really epic James Bond game for the 64, but idk

Counter-strike... seeing as how this is in the PC forums I;ll avoid naming console only games

Counter-Strike.

I grew up on that game. Fucking aces.

As this is PC only, my choice would have to go to Counterstrike. Team Fortress 2 is also quite enjoyable.

I can't believe that no one has metioned Quake 3. Shame on you!

I thought about quake 3, but i think UT 2004 is better.

a lot of mixed feelings on this im getting from most of you... but i'd probably say it has to be Battlefield 2, even tho my personal favourate is the original Delta Force 1. There isn't anything else like it out there that plays anywhere close to that game, and i feel it kinda revolutionized the tactical shooter / clan base for online shooters today in my opinion.

Delta Force was the original pc shooter that got me into them so that is one of the best, but as for right now I think Team Fortress 2 is badass. It's really laid back and the graphics help give you that feel to the game, but that's just my opinion.

cod4

Counter Strike Source is a good one.

Counter-Strike is my favorite, Starsiege: Tribes and Quake III are good, too.

Alien Vs Predator 2

As for best right now....Team Fortress 2

Counter-Strike/Css for me. It just is the archetypal multiplayer shooter on which all others are kind of built.

Team Fortress 2 and Call of Duty 4!

"Delta Force was the original pc shooter that got me into them so that is one of the best, but as for right now I think Team Fortress 2 is badass. It's really laid back and the graphics help give you that feel to the game, but that's just my opinion."

Team Fortress 2

I'll say Counter-Strike. Just throwing this out there, but I'm 99.9% sure it has the most custom content of any FPS.
The franchise boasts over 20 000 custom maps, thousands of custom models and skins, and many, many, many mods/gametypes.
It's also quite old now and still had (last time i checked a few days ago) over 60 000 players for one day on CS:S

I say battlefield 2 for sure, Cant wait for battlefield 3!!!

I would have to say Counter-Strike Source, then the Battlefield series in a distant second.

Halo, Call of Duty 4, also 2142 was pretty good.

The one I've played the most would probably be RTCW and RTCW:ET, followed by Quake III and CoD,UO,2,4.

I'm going to go with the Free Multiplayer game only, RTCW:ET.

Counter-Strike 1.6

Balanced game play is the name of the game here.

Day of Defeat: Source for me. I could play it for days on end.

all time: TRIBES 2! I am surprised at the lack of tribes love in this thread...

right now: tie between cod4 and tf2

Natural Selection in my opinion. I love the unique game mechanics and gameplay. My best multiplayer experiences have been with that game.

Call of Duty 4.......so many hours lost.

"Natural Selection in my opinion. I love the unique game mechanics and gameplay. My best multiplayer experiences have been with that game.
"

Team Fortress 2. The best of the best it is. Most balanced too.

Counter-strike.

I like Cod 4, myself.

Team Fortress 2 IMO.

damn you youngins and your new fangled dingle whoppers!
... what ever happened to the CLASSICS ... like TFC ... DOOM ... QUAKE?!

And not many may know of it but I loved a little HL1 mod called Firearms ... good times ...