Honestly I hated Arkham Knight when I bought it on PC on release day, but when I played it on the PS4 it was a blast to play, though after a couple of months I had to give it as a freebie with the PS4 when I sold it, but still have the steam version anyways(which is working better than ever compared to launch day too).
Anyways. . .
1. Arkham Knight
2. Arkham Asylum
3. Arkham City
Also enjoyed Origins but not so much as to replay it again.