What are your top ten favorite first-person shooters?

[BrayanA]

1. Half-Life + Counter-Strike
2. Quake II
3. Half-Life 2 + All Episodes
4. Doom 2
5. Bioshock
6. Duke Nukem 3D
7. Hexen
8. Blood
9. Serious Sam
10. Delta Force

Honorable Mentions:
Halo 2
Medal of Honor Allied Assault
Delta Force 2
Hexen 2
Doom
Doom 3
Far Cry
Shadow Warrior
Red Faction