Just finished Sleeping Dogs. It was OK. I liked the hand to hand combat and parkour stuff, even though it eventually got repetitive. Without it, this would have been really boring. I did a good amount of side content (got my 'Face' to level 10, did all cop missions, collected all the statues to learn new fighting moves), but stopped as soon as the rewards became worthless, i.e. money only.
Nice to be in a Chinese city for once, but the characters and relationships ultimately weren't that interesting. Wei's increasing dilemma as an undercover cop was well done. For the most part though, I just drove to marker and did the thing.
