I would describe Theater of Sinners as a well-thought-out drama of the abusive kind. People with an abusive upbringing do abusive stuff, sometimes because they learned to enjoy it and sometimes because they don't know better. This leaves lots of room to be aroused, to embrace perversion and kinkiness to questionable moral levels.
But honestly, there are many AVNs out there which are abusive. Some of them utilize it for selling purposes, some do it as a fan-service or to channel their inner perversion. Theater of Sinners doesn't feel like that, it has more quality than is typical for this kind of plot. The main antagonist Beca is very relatable, if you want, her evil nature is excessive, but you may as well choose a lighter path that (in my opinion) fits her better.
Beca is the star of this show. She is written very well; she acts evil but she is also a mastermind and strangely empathic... or sociopathic? Hard to tell at times. Too smart for her own good in any case, and unaware of her own tragedy.
Most main characters are written well, choices feel meaningful and although kinky they help to immerse and choose your own level and direction of perversion. All main characters live unfulfilling lives, are disregarded, ridiculed, or simply struggling with their past.
The kink characters however - those are characters without a story arc, they solely exist to lead main characters astray - feel less lively, they are no better than in any other AVN of the mediocre kind. But for me those are background noise. I was glad that I could avoid them for the most part as they certainly emphasize how grim this world is, but they are way too superficial and tropey to be a convincing plot device.
If you enjoy kinky and abusive plots but also want some depth and tragedy to go along with it, Theater of Sinners is certainly a good choice. I didn't play to the end of the current build, but I've been impressed by what I have seen so far. I'm a bit sad that there is no patreon to show some support.