There was stuff I preferred in AA, and a month later after AC has been out and I've played it 5 times now and had time to let it really sink in, I'm thinking I might like AA a bit more overall. What I didn't like about AC was:
- Too many distractions with the side missions that had nothing to do with the main story. I liked the more linear format of AA.
- Two Face and Hugo Strange were so under used. Especially Hugo who I thought was supposed to be the main baddie, and we only saw him at the start and at the end. You couldn't escape the specter of Joker in AA. He was everywhere. Whether popping up in random levels to cause mischief or being on the Arkham monitors taunting you all through the game. Plus Hugo did sod all in his final scenes except just stand behind a glass panel talking crap. To make things worse we find out he's just a "puppet" to Ra's.
- The Ra's Al Ghul stuff felt out of place in the gritty style of Arkham City. Especially that desert level. Frankly I wish Ra's and Talia had not been in it at all.
- I enjoyed playing as Catwoman, but her levels, like the side missions didn't have any part in the main story.
- The main story itself kind of fell apart in the third act once protocol 10 started happening.
What I liked:
- Joker, Penguin and Mr. Freeze were all fantastic. Particularly the Penguin who was a really vile piece of work and his museum level was so much fun to do.
- The atmosphere of Arkham City, especially in the snow. I find myself popping in the game just to glide all over Gotham's breath taking visuals.
- The combat was much better and the new gadgets were terrific.
- Grapple boost gliding was awesomeness.
- The voice acting, apart from the guy who did Ra's, was all spot on. Especially impressed with Tara Strong who did a damn good impression of Arleen Sorkin for Harley Quinn.
- The Mad Hatter side mission was the brilliant and the best of all the side missions.
- The score for the game was great.
Overall I love Arkham City, but I think I prefer AA more. AA had a more linear format which I enjoyed better. With AC you could veer off for hours just doing side missions that have sod all to do with the main objective. The story was better in AA and felt more organic. Not one villain featured in AA felt unnecessary, whereas AC suffered from a villain over load, and several of them, like Two Face and Strange, suffered because of that.