Marvel Ultimate Alliance
I'm not sure how well it works playing by yourself, but it's definitely a fun party game. Playing with three friends, working together, using your powers to help each other out, and ganging up on helpless enemies can be a blast. I got pretty far in the game on the Xbox, but we ended up never finishing that game, and I didn't see the end until I played it with a mostly different group on the PS3. It was just as fun, and looked better (besides the always horrid in-engine cutscenes), but the added SIXAXIS tilt functionality didn't add anything and seemed broken. Not only did it not seem to work at times, but a diagram with the controller and arrows showing where to tilt just isn't as easily recognizable as a color-coded button. It can be turned off though, so it didn't really hurt the experience. It's not the best or most polished game, but with a good group it can be an enjoyable, lengthy experience.
