It's a bit rough around the edges (a diamond in the rough if you will) and isn't a particularly good looker, especially as it had gone through a bit of development hell (it was originally going to be part of the True Crime series called True Crime:Hong Kong, but it got cancelled by Activision before Square Enix bought the publishing rights and renamed it to Sleeping Dogs).
So long as you're not expecting it to be on par with GTA (it isn't), you might like this.