CAMPAIGN:
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I'm sure you read many reviews already, so I'll keep this short. The lack of a campaign does hurt a lot more than it sounds. I played one race then I was like now what. It really took away from the game. There was no motivation to play. But the lack of a campaign is covered by the driving challenges. These were very addicting and took my time away from me. I put many hours into this mode. it's actually EXTREMELY ADDICTIVE.
GAMEPLAY:
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This is the best driving simulator you'll play on the PSP. On professional mode, you can feel how the car turns. The physics are truly amazing, especially for a PSP game.
GRAPHICS:
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The graphics were nice for a PSP game. The game is VERY fluid and smooth. Sometimes, there are these random white lines, but it was barely a bother, and it's barely noticeable. The cockpit view is a bit disappointing. No interior, it's just black. I mean, if you could fit 800 car textures in less than 950mb, why can't you add interior textures.
SOUND:
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Sound is pretty good. The tracks that they play was pretty boring, but after I unlocked the ability to use my own music, it was pretty nice.
ONLINE PLAY:
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I would've liked to see online multiplayer instead of just trading, but I didn't have many expectations, and I don't really have access to the internet without tethering my phone to wifi on the train ride to work. So the lack of online play hurts replayabailty, but I wasn't really expecting much, because most people don't have access to the internet when using a PSP most of the time.