Well, actually, this game is just "not what it could easily have been", but I wouldn't recommend not to buy it, cause it's still a nice game! For $15, which good game do you have? Trials HD/evolution, and...? Not a lot.
If you enjoy skateboarding (and you're here, so you do), you'll have more fun playing this $15 game than a lot (most?) of $50/70 games.
Let's say that for us its a good alternative to Skate3, like when nobody's online and you have no inspiration at all for tricks or filming