I couldn't get into Arkham City. For a "city" it's extremely linear and there's not nearly enough "set piece" moments for a linear game, so it tries to be open but fails, but then fails on being linear as well.
I just feel bored flinging myself around quest area to quest area with nothing in between. I think the game would have been 100x better if they kept the linear style that the first one had, down hallways/set paths, as they didn't make this one nearly open enough and I think it loses all its pacing.
I am quite disappointed in it given how good the first one was.