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 actually think it is one of the best self-help books I have ever read and it definitely helped me change for the better. (That said, the absolutely vast majority of self-help books are utter trash so that is not even that high of a praise.)
I am in neither camp. I just didn’t have any good role models growing up. I had to read up on how to be nice to people because that isn’t something I learned how to do as a child.
One shouldn’t follow the book to religiously but for people with lack of social skills it is one of the better books. At least compared to all the pickup crap.