Good game. Honestly, I think they rushed out a release because the Mayan prophecy is a major plot point and they wanted to release it before 12/21/12. It wasn't ready for release, I've logged about 4 hours and I've seen a character talking without moving his mouth in a main plot sequence and enemies standing on air. But if they released it after 12/21/12 the world ending story would just seem silly.
The Colonial America setting works, but it'd be nice if every alley in the city didn't look identical. The combat is fun but it'd be nice if they didn't just kinda copy the only thing about Arkham City I didn't like. So, yeah, it's a good game, but not one it's easy to be excited about playign.