I would rate this game as excellent. It takes a bit of getting used to but I would say that for any game. Once youve got used to it you realise how sensitive the Kinect is to your movement and you can pretty much put the car where you want it.
The game has lots of different modes. I love the battle mode which is just like Super Mario Kart with weapons etc. On the tracks there are jumps and you can perform stunts by moving your body.
Played it on 2 player last night and had a real laugh....even non game enthusiasts enjoyed it.
I found this game didn't really keep me entertained for long - it's basically like Mod Nation Racers, but without all the cool bits like track editing etc. I found that my arms got tired quickly having to hold them out in front of me all the time, and the motion tracking didn't always follow my hands that well for steering. The only thing that keeps you playing is the ability to unlock cars and tracks, but even that loses it's appeal after a while. A good gimmicky game, but that's about it.