Although I heard it's complete shit compared to it's 360 counterpart, I've been having fun with it for the most part.
The motion controls work surprisingly well with this game and the music is great. Too bad a lot of stuff got axed from the original game though, like alternate endings and some psychopaths (Although we do get their zombie counterparts. They don't really add to the story though.)
Anyway, I can appreciate Frank West a lot more now that I actually got to play his game, and I'm glad he's going to be in MvC3.