It's a good game and they fixed some annoying niggles with the combat systems from the first game, but I definitely prefer the design bent of the first one more. There it felt like they only included what was necessary and didn't include anything that didn't belong. You had enough freedom to navigate the environment to make it feel like you were in control, but it was locked down enough to really let you take it all in. With arkham city, it's like they just included everything they thought of. Some of it is great, but it's like one building is about as interesting as the next. It may work better for some people, but I'm not a fan of the 3 ring circus approach. I am liking the story a bit more though. The storyline feels a bit more logical.
Not interested in DLC. When I finish I will rather move on to the premier content of another game rather than the sloppy secondary content for this one