Nice to have a title like this for the Xbox360. Nice graphics enjoyable play, but maybe a bit more forgettable. I enjoyed playing it with my wife, who finds most games on the Xbox to be out of her interest range.
If you've played Mario Kart you've played a better version of this game. With only a few differences (not for the better) this game emulates the Mario Kart formula exactly.
The big issues stem from some poor level design. You'll find a lot more cliffs and jumps that can easily lead to you falling off. Even scenes where you're meant to hit speedstrips before a jump you'll find yourself going so fast you actually overshoot the jumps and fall off the track. And more often that not you'll end up battling with a ledge as you're stuck between a "on the track, off the track" status and just sit in one place wasting time.
Ultimately I sent this game back after I unlocked all of the content. Despite the shorcomings this game was some fun. What I'm really hoping for now is a "Sonic Vs Mario Kart" game...only it be done by Nintendo :)