Daikatana.
If you haven't heard of it, I highly recomend checking it out. It's def up there as one of the best and most influencial fps games of our time.
All Doom series,
Unreal tournament series (mostly 2004) (still have to buy UT 3)
Return to Castle Wolfenstein,
Quake 1,2,3...haven't tried 4 yet.
Wolfenstein: Enemy Territory (played this game as hardcore as I play GW today).
F.E.A.R Multiplayer version only.