Just beat the main story. The ending was good, but it was over sooner than I expected. I've played it pretty much nonstop over the past couple days and I didn't want it to end. I didn't like it at first, the open world design didn't seem like a good idea and the major villains were introduced too abruptly, but during the
mission, it started to click with me. It's a very well crafted game in general, the combat is so smooth and satisfying, the predator scenarios were fantastic, the production values are impressive and it makes great use of the license, and there's a lot of content between the story, side missions and challenge maps...overall it's just a great package, something that only a few exceptionally talented developers could pull off. I found the story a bit unfocused, and the Catwoman segments should have been more fleshed out (I loved playing as her), but it was a great experience. I'll have to make room for it on my GOTY list.
I just wish they didn't lock away so many challenge characters as DLC, it's such a ripoff. I'll probably suck it up and buy them anyways...
edit - ooh looks like more
, I will definitely keep playing.