It's more Batman.
This one probably plays the best, the combat is very good and the Batmobile was a good addition to the series.
The story was ok; extremely disjointed, the Joker parts were fantastic, the Scarecrow/Arkham Knight stuff was lame. I found the portrayal of Gordon and the entire GCPD was borderline offensive, the game really makes everyone but Batman out to be pathetically weak.
I think Asylum and Origins had better stories, but this game has the very best Joker that has ever been in this series.
This is the only game in the series that I've done any of the side missions for, and they were all very good, surprisingly good, I'm thinking about going back to the other games to do them good.
I played this game on PC pre any sort of patch and had no issues.