I have to say how pleased I am that this game seems to be good - a friend of mine worked on it before it was canceled, and the team at United Front suffered greatly under Activision. So it's great to see that they're being critically rewarded in the end, and hopefully the sales back that up, too.
Having learned nothing from True Crime 2, Activision cancelled the game because United Front needed time to make it good after Activision blew the scope way out. The game was originally an original, linear kung fu game, and they turned it into an open world True Crime sequel without properly scheduling for such a massively expanded scope.
Also, I know everyone loves to hate on Square Enix, but I think they really do deserve some credit for signing this and giving them time to finish it and make it good. Legally, signing a project handover like this is more difficult and expensive than a straight-up development deal, and Activision's hyper-competitive, slash and burn mentality can't make that any easier, either.