Good game. Graphics are so so for a PSP, could have been better, especially if you look at Gran Turismo PSP.
Gameplay wise the AI is slightly dumb and can push you off the road.
Overall a great game (if only because of the 2009 season with Brawn, Vettel, Hamilton, Singapore, Valencia & Abu Dhabi)
One warning though. After doing the Abu Dhabi GP for a few laps saw that the day night cycle was not working, so did a full laps race to check. It stays as daytime for the whole 55laps. Slightly dissapointed in that. Singapore looks awsome at night, and what a track.