Well, having played a few of the previous Ben 10 video games, including Ben 10 Alien Force and Ben 10 Alien Force: Vilgax Attacks, I have to say that Cosmic Destruction is the best one yet. Not everything is perfect of course, but it made several improvements in what I thought were the other games' flaws. First of all, this game is for 1 player only, which I thought was great. Alien Force gave you the option to have a friend helping you through a 2P coop mode, but instead of choosing from different characters from the show, both players had to play as Ben 10 which was both weird and confusing.
The graphics were greatly improved and the cut scenes are really nice. The way you transform into the different alien forms and use their special attacks was also improved, which was the best part for me. In Vilgax Attacks, you choose an alien form and transform, but if you want (or in this case need...) to change to another alien you have to change back to Ben, look for the other alien form and then transform again. Here, 4 different alien forms, which can be changed at any time, are assigned to the 4 directions in the control pad, so you just press and transform. Depending on the mission, the game recommends a group of aliens that would be most useful in that particular stage, which is very cool. Plus, it means that you're not stuck with the same aliens over and over. You also have the option of upgrading the aliens' attributes and special attacks.
I have to say though, the game is rather short and the parts where you go "ultimate" are brief. It is also a giant puzzle, so you have to be smart and patient and remember that it is rated E10+. I found that this game was mainly designed for fans, because if you're not familiar with the alien forms and what they can do you're gonna have a hard time figuring out what to do. You learn along the way though.
For the most part, I really enjoyed this game. Some people will find it better to rent this game because once you beat there's not much to do except beat it again, but I think you should at least give it a chance.
Pros: graphics improved, great story and amazing characters, controls are easier than ever
Cons: kind of short and somehow difficult for younger kids, becomes more difficult if not familiar with the show