I haven't played very many FPS games but these are my favs form what I've played

10. The Conduit

9. Halo: Combat Evolved

8.Call of Duty:World at War

7.Call of Duty 4: Modern Warfare

6.Metroid Prime 2:Echoes

5.Halo 2

4.Halo 3

3.Call of Duty Modern Warfare 2

2.Metroid Prime 3: Corruption

1.Metroid Prime