What are your top ten favorite first-person shooters?

[FKNetwork]

Here's mine:

 

1. COD 4
2. COD: World At War
3. Halo 3
4. Goldeneye 007
5. Battlefield 1943
6. Left For Dead
7. Halo 2
8. Battlefield Bad Company
9. Killzone 2
10. Half Life 2