I played through this one three times. The first time my save file was corrupted after the first major patch to fix everything, and I was on the last segment fighting the Arkham Knight tank. 3rd time was NG+. Nearly 100%. The poison ivy plot was one of my favorites of the series, along with the Joker mind fucking. The main villain was predictable, though the Scarecrow filled in well enough.
Dunno why I enjoyed this one the best, likely all the platforming requirements. I'm sure a lot of folks didn't get enjoyment out of the Catwoman or Riddle scenarios, but those were fun to me. And the Azrael challenges, especially the last one was incredibly hard and rewarding.
Knight, City, Asylum, Origins for me. I'm sure I woulda liked Origins more if the game didn't run like trash and crash all the goddamn time when I was playing it. Also, I received two physical copies of the game to start, the first copy didn't have a game code, and then neither did the second. I had to go through some hoopla with the game company to get them to issue me a code. Like they really didn't want me playing the game. Conversely, everyone seemed to have issues playing Knight on PC, but it ran amazing on my system.
Also, with the way you could travel around in Knight made me really hopeful for a Superman Metropolis or Green Lantern game. Hell, even the Flash might be an interesting redesign. At this point I'd just take another of anything in this genre in the DC universe.