DarkAssassinXer
Dweller of the Clockwork
For me, I'm trying to get into Metroid but I just can't. And I personally refuse to get into Star Fox
Definitely Metroid. I'm not so big on the side-scrolling ones, and I don't find the Metroid Prime games to be particularly good FPS'. Perhaps would feel differently if I could use a mouse and keyboard, much prefer that over any controller, but nothing stood out for me.
The Prime games aren't FPS's, though. They're FPA's -- First Person Adventures.