I've played it for a few hours last night as I've got it for the PS3.
Graphically it's good, however, being in black and white for half the game pisses me off - although my friends like that.
Gameplay wise it's like GTA and Tomb Raider had a really, really sexy and talented love child.
The main character makes me laugh, he has some very funny lines.
The story is the old "Revenge blah blah blah" like most sandbox games that hand you weapons.
The time period ruins it slightly as there are no real "OMGZ! This car can go a trillion miles an hour fun fun fun" and although there are lots of different guns types there is no massive high powered killing machines that I've come across.
So far however I'd give it 8.5/10 although my brother does say that it's incredible once you've really got into it.
I'd recommend if you've got some spare cash to buy it although it won't be winning no game of the year awards.
....oh and there are also boobs in it...