Not very good...
The Bad: Tacky gameplay, bad controls, boring bosses
Full Review: While the car levels are great, once you get to the first boss, the game gets bad. VERY bad. The first thing you'll notice is that the boss is incredibly easy, and you will not have much trouble with the other bosses either, they're just as bad (ie. BORING). The controls suck and your attacks are a pathetic rip-off of classic Mario. Leave the jumping to someone who knows what he's doing. The gameplay sucks too. The only plus side is the music is great, but that's vastly outweighed by a sea of shortcomings.