Like the title says, here are my picks:

1. Half-Life 2
2. Halo Combat Evolved
3. Deus Ex
4. Crysis
5. Marathon
6. Team Fortress 2
7. Doom
8. Counter-Strike
9. Call of Duty {The first one}
10. Quake II

Honorable Mentions:

• Resistance Fall of Men
• Perfect Dark
• F.E.A.R.
• Rainbow Six Rogue Spear
• Battlefield 2

EDIT: I'm so going to be hanged by the gaming community for not adding GoldenEye 007 on the list.

I just have one sadly , Call of Duty 4.

But these are not in order of my best, to hard to decide.

1. Counter Strike (PC)
2. Left 4 dead (PC)
3. Half-life (PC)
4. Delta Force (PC)
5. Golden Eye (N64)
6. Aliens Trilogy (PS1)
7. Team Fortress 2 (PC)
8. Quake 3 Arena (PC)
9. Unreal Tourament (PC)
10. Battlefield 1942 (PC)

Doom
Wolfeinstein 3D
Unreal Tournament
Halo PC
Half Life

You see to be missing five more games.

resistance 2
bioshock

You need to play more FPS games.

Hm, let se... First 3 is easy.

1. Halo 3
2. Goldeneye 007
3. Halo
4. Half-Life
5. Counter-Strike
6. Duke Nukem 3D
7. Call of Duty 4
8. Doom 3
9. Quake III Arena
10. Delta Force
Im just to start to play Half-Life 2. Yeah, shame on me for waiting so long.

1- GoldenEye 007 (N64)
2- Halo: Combat Evolved (XBOX)
3- Quake III Arena (DC)
4- Counter-Strike (PC)
5- Call of Duty 4: Modern Warfare (X360)
6- Half-Life (PC)
7- Metroid Prime (GC)
8- Half-Life 2 (PC)
9- Halo 3 (X360)
10- Doom 3 (PC)

I can give you 3 because I barely play FPSs actually:

1. Call of Duty 4: Modern Warfare
2. TimeSplitters 2
3. Call of Duty: World at War