Nice pic!
My favorite boss? There can be only one
As for my favorite game, Metroid Fusion, for sure. Yeah yeah, it is linear yada yada, but I love the creepy atmosphere, the music and SA-X.
Quadraxis was AWESOME. One of my all time favorite video game bosses.
I'd have to say Metroid Prime is my favorite Metroid game. It was also the first one I ever played. I love the Prime trilogy and loved Super Metroid & Metroid Fusion. Heck I even enjoyed Other M. Sure, as a METROID game it wasn't that great but as a game in general, it was pretty freaking fun. Story was pretty bad at times but the gameplay was fun IMO so at the end of the day that's what mattered to me.
If I had to rank the ones I've played it'd be:
Metroid Prime
Metroid Prime 3: Corruption
Metroid Prime 2: Echoes
Metroid Fusion
Super Metroid
Metroid: Other M
Metroid Prime: Hunters (The only Metroid I don't like so far. Didn't even finish it because it just bored me and couldn't compare to the other Prime games. The control scheme was also cumbersome but I'll admit the online multiplayer was fun even though I was terrible at it, lol)
Haven't played Metroid, Metroid 2: Return of Samus or Zero mission yet.