The DS touchpad and special features were hardly used at all. Aside from the outfits, there are no special items to collect or find. No hidden characters, no portrait pictures of the heroes and villains.
The visual presentation will suck in fans of the show, and the story should placate anyone who follows KP’s adventures. However, due to the lack of replay value, I’d advise those fans to either rent the game, or wait until the price comes down.