SimuLord said:
Spend the 20 or 30 bucks for Team Fortress 2. It's just better that way.
I don't know about that, it's a cheap ripoff of Wolfenstien: Enemy Territory (and Wolf: ET is free)
http://www.splashdamage.com/wolfet
Also here are some games that are free too:
http://www.tomshardware.com/forum/101029-13-free-midway-games
Here is the list of the free games:
Area-51, PSI-OPS, The Suffering, Far Cry, Prince of Persia: the Sands of Time, Ghost Recon, Rayman Raving Rabids, Full Spectrum Warrior, Rise and Fall: Civilizations at War, Savage 2: A Tortured Soul (yes, I know that some of these are not FPS, but I just wanted to put up a full list if your interested in some of the other games.
P.S. If you love Wolf: ET and you have 30 bucks, pick up Enemy Territory: Quake Wars and get a real deal