give me your top ten First person shooters of all time list here

[Reasonable]

Going with anything that resembles FPS and excluding MP only titles (because I always want SP/MP with the same title) I'd say:

1) Deus Ex
2) Half Life series with Half Life 2 the stand out for me
3) System Shock series with SS2 the stand out for me
4) Halo CE (on PC)
5) Doom series (Doom2 baby)
6) Unreal
7) Stalker SOC
8) CoD series (4 probably best for me)
9) Quake series
10) Stalker SOC

I have poured insane hours into the following MP, so they get an hounerable mention:

Doom
Quake
Day of Defeat
Counter Strike
Unreal Tournament
Unreal XMP
Enemy Territory