
My first exposure to Metroid was Metroid Prime; prior to that, I knew EGM had ranked Super as its best game of all time, but I remembered it as that game I always saw at Blockbuster, and thought was another JRPG cause of the dragon, thusly staying away, despite that awesome box art making me really curious.
Anyway, having now played Metroid, Super Metroid, and Metroid 2 in some fashion, as well as beating both Zero Mission, Fusion, and Prime, and getting pretty far in Prime 2 through multiple rentals, I can honestly say Fusion and Prime 1 are my favorite Metroids.
Other M actually looked good minus the story, and what I played at a friend's seemed promising, so I don't blame you for liking it; the story on the other hand I have seen on Youtube (retsupurae video; think Rifftrax, but videogames), and ... yeeeah, no.
As for Zero Suit Samus, contextually, that ending was awesome.