I’ll go with the low-hanging fruit: Mein Kampf. I’ve read it, cover to cover. As a piece of propaganda, it’s good. As an example of good writing? Absolutely not (though I will admit I have only read it in translation). Oh, and the whole fascist, racist, and generally shitty worldview of the author that he infuses into the text. And the fact that the author is literally Hitler. You 5-star that book? You’re a Nazi. Period. And as a Jewish person, I don’t look too kindly on them.
Appropriately for this thread, I actually read this book when a guy I was dating at the time told me it was his favorite. He was a great guy and I understand he’s now a great husband (we are still peripherally in touch). Politically we are reasonably well aligned.
But yeah, the traits within him that loved that book and the traits within me that loathed that book are definitely a part of why we were a poor match.
Eh. Depends on the person’s life stage. I read this in high school and loved it. Won’t judge any teenager who would be into it. Someone 30+ I would view differently though.