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’s probably the sort of thing that neither of them was able to adequately process until after the events of the novel. There are plenty of stories where someone does something dickish and the characters are all “Well that was rude, back to surviving the plot” and it doesn’t get addressed unless that’s what the story is about.