I agree with El Shaddai, or its demo at least. That was seriously not fun or interesting at all to me.
I'm gonna catch crap for this, but I personally wouldn't recommend Metroid Prime 2. So far it's the only Metroid to date that I haven't enjoyed (still haven't played Prime 3 or Other M though). I hated backtracking, the light/dark ammo thing was kind of annoying after a while, and I died often enough on bosses that I kind of wished they'd have put the save stations closer to the boss rooms for the sake of convenience. But the missable scans probably annoyed me the most. I'm really nitpicky when it comes to completion percentages in a game, so it drove me nuts when I'd have to fight a boss a good number of times: I'd forget to scan each part/phase the time that I finally did beat a boss, and then save without realizing.