You uh, you know that Cassandra does have a therapy route, right? That route consists of, well, therapy. All you have to do is not drink the tea.
Oh, and uh "mind control" is very clearly one of the tags. I'm not sure how you missed that, but I assume you deliberately overlooked that in order to complain.
I just finished the Hucow path so I'll chime in. It's not so much as a complaint as it is a surprise that it went straight into sex slave territory. After playing some of the ReEducation routes, I was expecting Valerie to do what Rachel wanted to do, using erotic hypnosis to solve problems. Seeing her as a secret supervillain was a bit jarring, and the bits at the end about using the University method to cut off Cassandra's contact with her family was pretty uncomfortable. I suppose it felt a bit too real, considering there are real life cults that use similar tactics, and it just made for an awkward boner when seeing that last shot of Cass as a mindless cow.
I haven't played the other routes yet, but that's just my thoughts so far. It wasn't bad. Considering it played into some personal kinks, I'd say it's pretty good. It's just not what I expected.
The option to drink or not drink the tea doesn't really signal how the story will go. Val gave a valid explanation for serving it, and if I was in Cass's position, I would have accepted it without question. Maybe there should be some sort of signal that drinking the tea will lead to a dark route? I dunno, I kind of like the sudden evil twist as well...
Anyways, I've rambled enough. I may play the other routes later and post my thoughts on those as well.