What is your favorite First-Person-Shooter on any platform.

Single Player: Chronicles of Riddick
Multiplayer: Halo 2

Well looks like Yoshi already gave my thoughts.
S-CoR:BB,
M-Halo2

I kind of liked PowerSlave on the Sega Saturn with the analog controller. That was really cool.

Without a doubt that honor goes to Namco' s BREAKDOWN!

HALO 2..

Counterstrike for PC, the best there ever was and will be.

Three-way tie:

Halo
Halo 2
Serious Sam

Multiplayer I love the timesplitters series. For single player, no other game has left me as imersed as playing far-cry on the PC. Especially the early levels in the game. the later ones aren' t as good.

in my younger years i would have said Doom, but looking back on the hours i wasted on that game i feel ashamed. i would also have to agree with far cry.....though the last few levels in that game are just retarded and they could have done without. awsome gameplay and graphics. but a little better story development would have helped.
i also just bought half life 2....this has been taking up alot of my time as of late. seeing as i just bought it though, i can' t really say where it sits on the scale of things right now, but it looks to be very promising.

CoR: EfBB
Red Faction
TimeSplitters 2
Return to Castle Wolfenstein
Halo 2
Unreal Championship

Halo
Halo 2
Red Faction
Half-Life

I forgot to mention Goldeneye 007 on N64.That is trully one of the best.

My Top ones are.

HALO series
Goldeneye 007

The PC FPS like Half Life 2,Far Cry,Doom 3 and PainKiller are so so.I download them play them for 2 days then burn them on a CD and never play them again,But i did play Far Cry For about 1 week.

i say halo 2 its a great game