One of the first game coming on PS3, doesn't feel next gen. game. It is still a good one.
Even though, the game is fun to play. Especially if you're a Marvel fan. There is so much stuff that relates to the world of the X-Men, Spiderman, Daredevil, Dr Strange, Ironman, Thor and many more. Of course, you don't have to be a fan to enjoy playing Marvel Ultimate Alliance (But if you want to become a fan I think it's a good initiation). I think there is enough explanation in the game to follow the story without even knowing a single thing about these superheroes.
There is two kind of way to play the game. You can go bash and slash in the villeins without even getting to know the story and customised your heroes who are leveling up! Or you can go the other way which let you immerse in these mutant world, customised your character, play the personal mission for each of your character (which can be good because it lets you unlock nice new features).
It's nice to play, but like any dash and bash game, after a while it gets repetitive. Of course, you can go and change some characters of your squad and you'll find a new way of fighting. Almost each hero feels different. There is more than 15 characters to play and each has its own personal grab.