What book have you read that wasn’t subjectively “bad” but you regrets reading all the same?

For me, Pretty Girls by Karin Slaughter. The book was engaging and it kept me on my toes, but I just with I hadn’t “poisoned my head” with all the graphic gore that was in there. I years later i still think about this and how I really wish I had never read it.

Question inspired by a comment /u/PrincessOfWales made in another thread :)