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.
I like Meditations but absolutely have not been able to stand the hardcore people into stoicism. People get really obsessed with it and it’s often twisted into a “everyone gets the same cards dealt, and even when they don’t, being unhappy about it is on you.” Almost like the sibling of toxic positivity.