In RockSteady's defense, they were contracted to create this. I feel a lot of the game's issue is this idea of getting a GaaS game out of a narrative concept. I feel many of the comic stuff is deeply grounded in a narrative style, they gamers want a story, good guys vs bad guys etc
Taking this IP and making it a GaaS seems like a massive miss as those that like MP might want something more focused on that idea and those that like single player stuff have little reason to care about this.
So, this can't really be RockSteady's entire fault, they where hired to create this, blame the publisher for thinking this made sense over a normal single player comic game, the thing this fucking team does well.
The days of getting some team to randomly TURN into a different team is pretty much done by many big publishers. Sony hires teams that have a history of MP, ie Bungie (wild to even say out loud Sony owns Bungie lolz) or EA with DICE or something, the fact that they are no longer doing the SP stuff with Battlefield or no MP stuff with Dragon Age, its clear they see this isn't really a thing you can just get any team to do, look at how bad Anthem turned out, clearly both Sony and EA and many publishers are seeing that to do any concept well, you must properly delegate out that work the the strength of those teams.
Too bad WB didn't get the memo...