The chief problem with the Ben 10 games is that they don't even give you all of his aliens. It's an average beat-em-up, with little variety. Bosses are easy, and the story is very short. If you're a fan ot the games, try it. If not, leave this one in the Omnitrix.
I really had high hopes for this game. I loved the last one and expected no less of this one. I was very dissapointed. There are too many glitches to count. Gameplay is not smooth at all. Jumping is a complete pain. The 3d views make it horrible to try and jump to certain spots, you think you should be jumping forward and it's actually off to the right or left a bit. Most of the problems are small problems that should have been fixed in editing, but end up adding up to a very messy game.