I've never ranked a game or movie a 10. Until now.
The story is comic genius, the voice-overs are perfect, and the protagonist of the story is just a hoot to play. The graphics are perfect - style just oozes from the many varied landscapes you will traverse. The settings are the most original and fun environments I've yet to experience in a video game to date. The controls are spot on (I recommend using the X-Box USB if you have it) feel good. The camera can be a slight problem at times, but as far as platformers go, this is about the best it gets.
This game is absolutely perfect in every which way. Gamespot says that Psychonauts "doesn't bring anything new to the table" which in this case is a dumb statement. When you produce a perfect game, why ruin it with adding a gravity gun?