Best FPS ever?

For me I would have to choose the Resistance series or Call of duty 4 Modern warfare.

What is your thoughts people?

Bioshock.

Well, I can't decide between "Halo : Combat Evolved" on the Xbox and "F.E.A.R." on the Xbox 360. I love FPS's in general, and these are the two that I like the most.

Halo: Combat Evovled and the honorable mention goes to Doom.

Doom Dabnabit!

Battlefield 2

Bioshock for single player experience.

For multiplayer the crown goes to Team Fortress 2.