Pretty decent for a PSP game. I'd recommend it if your into the Tony Hawk series.
A "Nail the Trick" mission can be found in each level, its very interesting, kind of like the create-a-trick option in the other games except with a timeline, possibility of missing it and wiping out and you can only kick your board to revolve it.
So yah, don't get it thinking it will be fantastic, get it knowing your going to play a good old fashion Tony Hawk series game.