My first Metroid game was Prime and i think it's an awesome game, i loved to explore the different places and Prime 3 made good use of the motion controls, those are things i actually missed in Other M.
But the storytelling... It's uninteresting or there wasn't a story at all. And i think Samus was REALLY boring, never saying a word, never showing any emotion, she kills her fellow hunters in Prime 3 and didn't give a shit about it, is she human or robot?
That's what i like from Other M, it shows who Samus was, what she thinks and feels. Loyal fans hate it but c'mon is shooting aliens and wearing spandex zero suit the only thing she's good for? The gameplay is awesome and the story is just epic. Other M has flaws but it's an amazing game.