Fantastic fun. Simple, random, and you'll find yourself coming back to it when you'd least expect it.
However, if you don't have anyone to play this game with, don't bother getting it. The game's real fun comes in the multiplayer. How could you not enjoy blowing up your friends' vehicles, especially just as they're about to win and then they come in last place for dying? I really feel sorry for those users who gave this game such poor ratings. It must be hard not having any friends...
The graphics in this game aren't spectacular, but aren't bad either. You'll find yourself too absorbed in the gameplay to care. The music, on the other hand, can get repetitive and annoying. It all sounds the same, and unlocking sounds from previous Kirby games doesn't really help much unless you are a super die hard Kirby fan.
The replay value on this game is good. You'll find yourself playing this game at the times when you have overplayed everything else. It's one of those "don't sell it or you'll regret it later" type games.
All in all, you'll be glad you purchased this game.