This game looks great on the PSP. It is a lot of fun, but the button control needs to be resigned. While hitting the L and R buttons on the PS2 controls isn't too hard, it's way too difficult on the PSP. You need to do this in order to get the special moves points. Without the special points, you won't win get very far. Your fingers start to cramp and it gets very frustrating.
However, the graphics are smooth, but it takes a looong time to get from screen to screen both before the game and when the game is over.
That being said, it will take you a long time to get through the whole game, especially in the city mode.
I would rent the game first to ensure it will not give you carpal tunnel syndrome before buying it.