Finished tonight. Might be my favorite of the three games, storywise. Everything wraps up extremely well, without the need for anything too insane as far as the final boss fight (*cough* Venom Joker and Clayface *cough*). As far as any concerns that people like Gooby might have had, no need. It sums up without any continuity issues, outside of the fact that he would never have given up a sweet gadget like Deathstrokes grappel for something inferior.
Also, very awesome comic nerd reveal post credits, alluding to another game that might not be focusing on Batman at all. Hopefully someone here plays it so it can be discussed. Anyway, highly recommended. Would definitely say don't be like me and do all the side things at once when they come up. THey're fun, but I think that that was all that made me feel like things weren't really moving, because the story proper really gets going and doesn't slow up by itself, particularly in the last 2 or 3 hours.