i thought arkham city was much better than asylum. recycled boss fights in asylum really puts a damper on the game. the final boss is horse shit, the game also lacks variety. Aside from the awful misogyny towards cat woman, city is pretty banger stuff. the boss fights are better, the fighting requires more timing (as someone who got the 100 combo achievement in asylum on hard mode, I was having trouble on the first fight in city), and the scenarios appeal to me more. The side quests are fun, riddler trophies take more effort and brain tinkering to get, the pacing is better, the way it utilizes batman enemies (deadshot

Zsasz phone calls

) is amazing. Just overall fantastic game aside from lame (and extremely homoerotic) ending.
I still haven't replayed it, and I severely want to one of these days. One of my favorite games of last generation.
The boss fights in City are seriously some of the best boss fights of last gen. R'as Al Ghul

Mr. Freeze

The Penguin scenario with the sharks

Goddamn what a GAME.