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.
My biggest problem with them is that I’m an adult and they’re children’s novels, and yet I’m constantly being asked if I’ve read them, do I like them, what about the movies, etc. I was lukewarm about them before Rowling turned into a flaming transphobe. Now I despise them and people act like I shot their dog.