Its funny that people just want the same shit over and over again.
The last Arkham game came out 9 years ago, so your description of "same shit over and over again" seems a bit odd. You think the fans of the series had been playing Arkham Knight non-stop for 9 years?
Let me guess, you're a big Rian Johnson / TLJ fan. The best thing a restaurant can do when you ask for a steak is bring you a soup instead. When you go to a clothes store and bring a shirt to the counter to take, the best thing the clerk can do is switch it for a pair of socks while you're not looking.
The most subverted your expectations get, the better.
But see, most people don't really work that way. Most people who order a steak actually want a steak. Most people know what they actually want or need, and they have no time to go back to the store and reverse the damage after some idiot switched the shirt they had in the bag for a pair of socks.
But Rocksteady didn't
need to keep making Arkham games. If they were tired of the genre, they could make some other type of game and pick up some other IP, no problem.
Instead they tried to trick their fans into buying a completely different game that was sold to them as a sequel to their own Arkham-verse.
Which is something Rocksteady
can also do, but they apparently forgot that their customers could also give them the middle finger and not buy their game in return, which is what happened.
Because most people have preferences and prefer paying for met expectations (and not paying for not met expectations).
Shocking.
So after 9 years of not releasing anything and then releasing a dud, the expectations-subverters who took the lead over at Rocksteady are probably going to lose not only their jobs but also the jobs of all the people in the studio.
Such is the price of "not serving the same shit over and over again".