-Goldeneye 64
-Halo 1,2,3
-Counter Strike
-COD4
-Marathon

Crysis
Call of Duty 4
Resistance: Fall of Man
Bioshock
Left 4 Dead

1.) Quake series (maybe leave part 4 off though)
2.) Doom series
3.) Duke Nukem 3d
4.) Half-life (only the first one. Part 2 was rubbish IMO)
5.) Bioshock
...
...
6.) Resistance 2 (just had to sneak this one in) :)

Crysis (PC)
Half Life (PC)
Call of Duty: World at War (PS3)
Duke Nuken 3D (PC)
Far Cry (PC)

every CallofDuty game...

1 - Half Life 2

2 - Half Life

3 - Unreal Tournament

4 - Counter Strike

5 - Doom 2

1. Doom (not 3)
2. Far Cry 1
3. Quake 1
4. HL2
5. Turok 2

C'mon, am I the only one who has heard of Painkiller? D:

I've only played 5 fps so ...:

1/ Killzone 2
2/ Resistance 2
3/ CODIV
4/ Resistance
5/ COD world at war

Nope.  I have it and Overdoese - it's a lot of fun, but nowhere near top 5 with the likes of Half Life, etc. to compare it to.  IMHO of course.