Added 'Spoilers' to the title so people don't accidentally stumble across the spoilers that are not tagged ><
Though yeah, my thoughts on the Arkham Knight game;
For what should have been the Arkham swansong it was weighed down by Scarecrow and Joker. This should have been focused more on the idea of the actual Knightfall storyline from the comics in which a villain mastermind organises a bunch of villains to each attack Batman in order to weaken him down.
While it included elements of this the reveal of the Arkham Knight as Jason Todd and the forced-in inclusion of characters such as Azrael, Robin, Nightwing and Catwoman didn't really add anything to the story. Robin's only purpose being to be told a lie by Batman that Oracle was fine, which led to nothing because she was revealed as fine ¬.¬
Personally I would have cut out the side story about the Joker's toxin and simply developed the idea that the fear toxin exposures make Batman worried he will lose control and be like Joker in a metaphysical sense rather than actually being physically changed or mentally taken-over by the Joker.
I would have also removed the idea of drone vehicles around the city and stuff along those lines which turned this more into a blow-them-up kind of game than the stealth action game that the prior games had
Though I still desire to see a continuation of the series with Azrael taking up the mantle of Batman, I feel that this isn't a solid ending to the Arkham series. Elements are good such as the original concept of the Arkham Knight as a villain from Batman's past who went to Arkham and wanted revenge. Part of me hoped they would pull a twist and have Hugo Strange revealed as the Arkham Knight instead which would have at least tied it to the previous game