My least favorite Metroid games are Fusion and then Other M, seriously, that game it just awful.
And Other M's pretty tight from a gameplay & visual perspective.
I'd be more than happy to make a thread solely dedicated to Other M, since it's so polarizing. I'd love to get in on this conversation too, since I have a lot to say about it.
I'll just have to do a forum search before hand and word the thread title so the mods won't kill me for duplicating some thread dating three years back, haha.