Don't Forget the PS3 version of Marvel Ultimate Alliance. Assuming you haven't tried it on any of the other twelve systems it was released on, why not try it on the PS3? It has the online functionality of the Xbox, 360, PC, and PSP versions (but not the Wii of course), plus the additional "next-gen characters" Moon Knight and Colossus.
So whether you're into comic books or not... hmm I'd say it's an okay beat-em up if you're not... but IT'S CLOBBERIN' TIME if you are.