Great in beginning but starts to get repetitive and boring...
Stealing cars (Peacefully by just becoming a passenger in the car), stealing "Tomacco" (mixture of Tobacco and Tomatoes), and being able to venture into many famous buildings (Burn's Mansion/PowerPlant and Simpsons house). Also, there were memorable quotes being said throughout the course of the game. Also, the player gets to collect coins to buy memorable clothes and memorable cars. This game seemed to be great and took a while to get boring.
After I got to Lisa, the game started to get very hard constantly racing other cars. Racing and Losing Races got very boring, and even if I were able to pass, the end just starts to get repetitive. Constantly racing and not a lot of variations (specially since it was impossible to kill anyone, when you ran them over they would fall down on their backs and struggle to get up). I think they could have made it much less repetitive.
All in all I think it is a pretty good game that everyone should try if they like Simpsons and Grand Theft Auto. You might find yourself picking it up every once in a while after you beat it, but personally I would reccomend just renting it and beating it then.