I hate that they went back to the joker shit as a crutch since they're incapable of doing anything without him
but I would be lying if I didn't enjoy that shit anyway. Maybe i'm the problem.
Other than that though, the arkham knight stuff was the worst story stuff they've done, and the game kinda didn't have enough to prop it up in spite of that. Sidequests were the worst in the series, and the boss fights were just awful.
Asylum was a crazy thing when it came out and I loved it to pieces. City and Knight make me feel that they got lucky with the first game. They never quite put it together in the right way after the first (and I like City maybe more than I like Asylum, but for specific reasons) and even then, it was shitty in a lot of ways too, but was a great first shot.
I dont know if it sours my opinion on the franchise, but it probably does.
More importantly though, it made me sour a bit on Rocksteady. They made a good batman game, and then used the same basic concepts and fucked it up (either by regressing or progressing in a strange direction)