A thread for all your FPS needs. A non-exhaustive list of good FPS:
Multiplayer
Quake
Unreal Tournament
Tribes
Xonotic
Counterstrike
Singleplayer
Doom
Marathon
Serious Sam
E.Y.E
FEAR
What was the last FPS you played?
What did you enjoy about it?
What mechanics or design elements set it apart from other games?