As long as you're not getting the activity studio game, you're in for a treat.
While playing this game, I was attached to it, and didn't stop playing until over 2 hours after I started. There's plenty of fun mini games and races, lots of characters to meet and challenge and a section in the main menu which lets you buy more characters to control, as well as paint works (just in case you're not happy with the cars looks), and it also lets you buy scenes from the movie, as well as previews of the upcoming Ratatouille (Pixar's next project).
The graphics were pretty good for a cartoon game, and the cars even manage to do perfect facial expressions every time they speak, as though they were really talking. In some games, like The Simpson's Hit and Run, the characters kept repeating the same old moves and their mouths moved in a repetitive up and down motion. But this game manage to do it right.
The game-play is great. The cars never oversteer, they just drive with ease. My only complaint was that the power-steer doesn't stop from crashing when you're going really fast, and it's impossible to power-steer when slowing down. But apart from that, the game-play is pretty sweet.
Anyway, if you like the movie, I suggest you get this game, but don't confuse it with the Radiator Springs activity studio.
Here's a hint: The main game is the one with the Piston cup race track on it. The other one has Radiator Springs town on it, and that one is the activity studio. So just remember that, and I check you later.