What are your top ten favorite first-person shooters?

[CaptainDJ]

1. Team Fortress 2 (PC)
2. GoldenEye 007 (N64)
3. TimeSplitters: Future Perfect (PS2)
4. Unreal Tournament (PC)
5. Perfect Dark (N64)
6. Call of Duty 4 (X360)
7. Half-Life 2 (PC)
8. Halo Combat Evolved (PC)
9. Counter Strike (PC)
10. Left 4 Dead(PC)