I really don't know why everyone bashes on Origins saying it's a bad game just because it wasn't better than Asylum and City. I mean what did y'all really expect?
What really turned people away is game quality at launch. I've bought it like a year later and by then it was definitely playable, although you could still run into bugs and visual glitches you'd never see in previous game.
Game itself wasn't really bad. Some things could be better, but that's it. I'd say it would've been better if it was lighter on recycled mech. While "same but better" approach works for core game, I couldn't get rid of thoughts like "oh well, obligatory mind screw scene, check; obligatory bullfight boss... twice... check; obligatory takedown exam boss, present; "dodge shit, throw shit back" boss, well; Al Ghul fight remastered, ok...". That is not to say that those were bad for what they were, mostly. But really felt too much like something you already did before. Investigation minigame became better, but IMO it could be less streamlined... Etc, etc.
Overall, it's not the problem with the game itself, but one should consider what it was for those who have played like 60+ hours of previous instalments - just not an improvement enough to justify spending more time on it than it takes to beat the game once.
Story felt different. It was a bit darker this time, a bit different and so interesting to follow. On the other hand, I feel that it lacks more consistent flow and solid interweaving of subplots of City's story. I guess it's inevitable when you bring so many different characters and try to fit them in a single story. Just sometimes it feels like participants are introduced through "suddenly, ninjas!" (sometimes literally, lol), and then they don't really interact a lot afterwards.
With all that said, maybe it's just me playing same game and expecting it to be something different
For the record, I played Asylum after City, and honestly it just hammered home the point of how frustrating and redundant some things in Asylum were and how they needed to go (and did in the City). Locked camera angles, throw mechanics, lack of convenient controls for remote batarang, no quickfire... Never again.
And Wouldn't batman getting killed bring the heat of the justice league on whoever did it? Same reason Flash's villains never kill him.
While game alludes to some members of it (through things like posters advertising Zatanna's shows or crates marked as produced by whatever Ollie's company name is), I don't think JL is ever mentioned directly in the series and the game does quite good job of not making entire thing a joke by introducing more "broken" DC characters. It's just different kind of story, and it's a strong point of Arkhamverse IMO - being somewhat more plausible and "realistic". Not quite Nolanverse, but not your average comic book cheesefest either.