Message from Arkham:

"RockSteady, I forgive your sins because...

Finally, the main villain is Scarecrow and his toxin.
The role of the Joker is awesome, marvelous—one of the best I've ever seen or read.
You gave us our own Winter Soldier.
My big, brutal, dark Batmobile, full of gadgets and ready to blow up tons of tanks and drones.
Gotham.
The tributes to The Killing Joke and A Death in the Family.
Tag‑team combat, hand in hand with Nightwing, Robin, and Catwoman.
Poison Ivy, her plants, and her major role in the story.
The long side quest of the Riddler.
I burned Oswald Cobblepot’s money.
I hit both of Harvey’s faces.
I witnessed the madness of Professor Pyg.
The fight against Man‑Bat across the sky.
The new combat options, combos, and some new finishers.
Everything ended where everything began.
The two additional cutscenes unlocked after the Knightfall Protocol."

Simply put, I'm a fan of the Bat, and I enjoyed this game so much.

In my opinion, this is the ranking of the saga: Arkham Asylum, Arkham Knight, Arkham Origins, Arkham City.

But if you want to play them in chronological order, you should follow this sequence: Arkham Origins, Arkham Asylum, Arkham City, Arkham Knight.

It seems this is the end of a great saga, but I hope the Dark Knight returns...