What's a book you regret starting to read, because you didn't realize you couldn't stand it till you were too far in not to feel obligated to finish it?

I'm not going to tell you the book I'm reading that inspired this because I'm not trying to start an argument about that particular book/author, but I'm in this situation with a novel and unfortunately it's super long, and I'm one of those people who feels compelled to finish stuff just to be finished with it.

in communities online when someone talks about a book they're not vibing with I see a lot of "stick with it, it starts off rough but it gets better", but much less "no, it doesn't get better. it gets worse. I wish I hadn't wasted my time" and I think the latter take is just as valuable, if not more. people only have so much time.