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.
How To Win Friends, Think And Grow Rich, and Robert Greene’s books are guides for human interaction that you can follow consciously even if you don’t feel any emotion during those interactions. But they all show that caring about other people—not just being polite to everyone, but learning about them as an individual—will usually make them care about you. Yes, this does benefit you, but your gain comes from being good to others. There’s no exploitation, just a much sharper awareness of relationship building. They definitely made me a better person. I was quite socially awkward because of my mother’s abuse and these books helped me connect with people. The world would be a much better place if people studied these books instead of following dogmatic religions.