I love this game, and not just because it boots up to the rock anthem "Paradise City" by Guns 'n' Roses.
It's a driving game, where you start out with a basic car, driving around town, finding challenges. Challenges can be a race, or a challenge to destroy other cars, or a trial to do stunts in a time limit ... each time you succeed, you collect new cars and things. Some are easy, some are hard, and your choice of car and strategy change things subtly.
It's an incredibly detailed world. The challenges are varied enough you can "just pick one" and never get bored. There are persistent challenges, too, like jumping through all the billboards you can find/reach. The music that plays throughout is great.
The best part, though, are the slow-motion playbacks of your spectacular crashes. Kaaaaaaa--boooooom!