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.
It’s perhaps worth noting that there’s a huge difference between the 1988 book The Alchemist by Paulo Coelho and the 1600s play The Alchemist by Ben Jonson. I’d be down with someone who rated the Jonson script 5/5. :)