It's ok for a few hours, but it's borderline to mediocrity.
The visuals are pretty good an the frame rate was pretty smooth on my PSP GO, the sound is not bad, but it was missing some of the sound effects that took away from the experience. The story it's pretty generic, and it got annoying pretty quick. There's a session of two anchors for this sports TV that are making these painful remarks about each other, it wasn't funny at the first time and it wasn't funny after a dozen times.
What's really important to me on a racing game is the racing, and I have to say it's quite bland, nothing really exciting to me. The weapons are bland, the strategy it's quite mediocre and to be honest the only unique thing it's the mod aspect of the vehicles and the character, but they don't seem to affect the stats during the game. Play if you must, but don't keep your expectations high for this one.