Just finished everything in the story, making me part of <0.1% of players on PS4 to do so (not a brag, nothing to be proud of, it's just crazy that they locked credits and the ending behind the Riddler stuff that the OVERWHELMING majority of players will not finish).
I'm super impressed with the game. I always thought Arkham City was a good proof of concept. A curiosity, I guess. Like, wow, you make Asylum work in an open world. It was never a must play for me, though. Most of the campaign was forgettable. My advice was always "definitely play Asylum, check out City afterwards if you really need more".
So, whodathunkit, Arkham Knight feels like the actual realisation of all the potential City had. Asylum and Knight are still very, very different games and I like both for different reasons, but Knight is the sort of game I'd recommend to people without reservations. There's an attention to detail coupled with a ridiculous scope that reminds me of a game like Resident Evil 4 or Metroid Prime. The way it plays with scale is pretty much unprecedented. Consider: you're driving around, launching out into the sky, drifting across the whole map in seconds, landing in an outdoor predator mission, jumping off that same building and gliding out into the city, landing in an "indoor environment" like the airship, hopping out and taking out a drone then landing back on the road and solving an intricate little puzzle and then calling the bat mobile and completely changing your relationship with the god damn same space all without a loading screen or hitch. It's the first game I've played that feels like it couldn't have been done on previous gen hardware.
So, mm, good work, Rocksteady.