Kameo is a fun little romp among a generation of games with no imagination.
As much as I love plot, this game didn't need its plot. It was a shallow plot with unlikeable characters with no depth and Kameo herself is insanely annoying. On the other hand, the game is creative among an uncreative mass of games, and as a launch title, could have been worse.
The combat isn't great, and the navigation could have been a bit better (especially with the short and unneeded cutscenes which frequent the levels). The game decided that instead of focusing on fighting and killing, it would mostly focus on travelling around puzzle-platform style, using the monsters' powers to solve problems and defeat baddies. The game implements this system pretty well. The complaint is that the game is very easy; it can be completed easily in one sitting if you're determined. The last boss is kind of a joke, but it is altogether a fun, if short, game.
The monster powers can be a little useless once other monsters come along. The water form and the first rock guy become pretty well useless after their respective levels and once you have Thermite, there's no reason to fight anything as anyone else.
Towards the end of the game almost all the puzzles are solved with Major Ruin and Thermite, and there's a distinct lack of creativity in the puzzles toward the end.
For all that, the Boss battles minus the last one are all very fun and remind you a lot of Zelda-style bosses where it was important to find the pattern, see what you need to do, and solve the puzzle to damage the baddie. This is something that new games seem to forget was an excellent formula.
This game was good, but it could have been better, if it were more challenging and some more puzzles and it would have been a lot higher of a rating. Even so, it's still a shiny little platformer amongst the cesspool of sh*t like Jericho and Kane and Lynch.