I just played through Metroid Zero-Mission & had the time of my life. So fun. I read all 16 issues of the manga which detail Samus' origin afterward, it's SO good. Seriously, if you're a Metroid fan but haven't read it, I implore you to do so. Insanely good art with a surprisingly powerful/brutal story.
Now I'm gonna play every other Metroid game 'cause I'm feeling the kick.