the only gripe I had with it was the boss fights. it went from "sweet bad ass boss I get to whoop Harleys ass!" oh noes. *send in wave after wave of thugs* and every boss is like that except Killer Croc.
another thing is that they could have totally crammed in more Batman villains had they not decided to thug rush you.
besids that, great story, fun combat, and good exploration. 9/10