Everyone that owns a PSP must play this game.
I wasn't expecting much as the PSP is full of Toned-down (mainly racing) games, but I knew Sony wouldn't disappoint me.
All the fun in the original Motorstorm is here. The crazy vehicles, the crashes and the amazing tracks. Of course the graphics are not as detailed as the PS3 Original Motorstorm, but this is one of the best looking PSP games out there. The game uses the PSP Hardware effectively. The single-player campaign is quite long and there is quite a lot of cars to unlock. There is also Online Multiplayer (altough today the servers have certainly been shut down), but the single-player portion is enough to keep you playing.
This game is also available on the PlayStation 2 and it is still impressive on a bigger screen.
Of course there are some problems, as the AI is not very intelligent (but still impressive, as, in normal races, there are 9 CPU-Controlled vehicles against you, which I tought this would be impossible in the PSP), but the game's difficulty at later levels keeps challeging.
This game is a must play for PSP and PS2 owners.
Do not miss this one.