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.
The book came out 15 or so years before the depression. America had a big social shift due to the industrial revolution and people found themselves doing jobs their parents never dreamed of doing. There was a lack of management at companies and a lot of people got promoted despite their social class and needed to learn fast how to fit in. There were other books published around the same time on similar topics.