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 is not a bad book for socially awkward people since it teaches the basic rules of social interaction that a lot of less awkward folk take for granted. I was a college RA in an elite university, and it was amazing how much social isolation could be improved by following that book’s advice. I’d put that book in the mostly harmless to positive category of self help books. It’d be more concerned with someone who pairs it with more Machiavellian books like 48 Laws of Power.