Has very good things, but also bad things
Good things:
Great graphics
Very entertaining
You can do nice stunts
Lots of vehicles
Lots of guns
A very biiiiiig map all for you
...
Bad things:
The main story of the game was bad (I didnt like it)and really really short
The secondary missions are always the same boring thing
The handling of cars and bikes, specially bikes, because the camera moves with you and its hard to drive..
...
Those are the main things i can remember right now...
So when you finish the main story... there is no much things you can do.. only the same secondary missions and getting objects, and then just mess around...