It might sound crazy, but I really liked Metroid Other M's story! I know everyone hates it, but I find enjoyable and explains Metroid Fusion's story quite well...
Anyway, the gameplay is really good, if only for a few problems I found. Runing in a 3d environment with a DPad is hard and unconfortable. I mean it works, but not as good as a joystick, of course. Also, pointing the screen with the wiimote to enable 1st person is a good idea, though it suffers from all games that have that mechanic, sometimes it takes too long to switch modes this way. I found myself in situations where I was in 1st person shooting missiles and needed to get out of the way, but I couldn't switch in time so I took unecessary damage...
Overall I think it's a really good game, but a few tweaks here and there would have made it way better.