Best FPS game you have played

Deus Ex: Human Revoltion

Before the console multiplayer fps fad and halo and modern warfare crap...I still play and will always love playing unreal tournament 99 and 04, and Quake arena.

Call of Duty 2

Cod 4

S.T.A.L.K.E.R series! Metro 2033 also was good.

Single Player: Half life 1/2 (can't decide, 1 has a lot of nostalgia to it)
Multi player: Unreal Tournament 2004
but I'm also loving Tribes Ascend (never played the old ones)

The original Call of Duty although a lot of new FPS games are better now, nothing beats the time I played Call of Duty

So hard to choose... Deus Ex series, Borderlands, Brink, Unreal Tournament...

hahahahahaahahahahahahaahaha XP this made me laugh

arma series

i enjoy some half life, but doom 3 had its moments of epic

Quake 3 Arena (name it Quake Live), Swat 3, COD2, COD4, Chronicles of Riddick Escape From Butcher Bay.

Hard to choose, there's a lot of good ones.

STALKER series is good, as well as Deus Ex, of course Half Life 2 & Eps... hmm

HALO 3

dark sector, fear series, bioshock series, half-life series, deus ex, doom, quake, the first far cry, black for ps2, timesplitters series for the ps2, and serious sam series

single player: i say, HL series, Borderlands and Bulletstorm (the hell, that game is fun) for Single player
CS 1.6, Quake 3 Arena for Multiplayer

Halo

Tribes 2

Counter Strike 1.6

Counterstrike 1.6

The only thing close is Natural Selection and that's (FPS\RTS)

Doom, FEAR, Bioshock, Unreal Tournament 99.

Star Wars: Republic Commando

Probably my favorite game of all time. "Wookie life debts for everyone!"

Unreal tournamet, Half Life,CS, Bioshock, some medal of honors,Seriou Sam, and more
the best for me is Half life series, but all are awesome!