True. For me the incest in Yosuga no Sora could have been done without. Everything up to the last two episodes was so amazing, but those two just go so dark so fast.

There are other examples, obviously, but that is one that my best friend and I talk about to this day. I suggested it to him after I had watched about 3 episodes and we both independently binged it and the next day kinda had a "what the fuck" conversation.