Thought of another good gamecube game: beyond good and evil. I have the PS2 version so it didn't immediately come to mind.

Metroid isn't really a FPS. It's more about exploring than shooting, which is why you have the lock-on system. Still, I admit the controls were a royal pain. I never did feel at home with them, however long I played. For me the exploration and detail made the annoyance of struggling to lock on worthwhile. Seeing the helmet visor mist up, bug goop splattering and blocking your view if you killed an enemy too close up ... and the incredible sights at some points in the game. The music was damned good too.

I didn't play Hunters. The controls can't possibly work, and it's mainly MP.