First Dune was Lawrence of Arabia fanfic with Hamlet sprinkled on top (took Brandon Sanderson to explain that familiar taste I couldn’t put my finger on).
With the positive influence gone, it just gets weird.
Aliya, Paul’s sister, is literally horny, so she decides to spare with a dummy naked. Of course she reaches level 11, while even the fencing masters are level 7. Then Paul walks in, and scolds her telling that he once reached level 10, but was scolded by his tutor for being so amazing in everything.
Later in the book, the story becomes outright petty. There’s a shapeshifter plotting against Paul, and he takes a shape of a Bedouin woman telling Paul that her father wants to share a conspiracy plot with Paul, but he must come personally accompanied by Chani, his concubine. A reminder, Paul is the Emperor of Mankind, 650 billion died in 12 years opposing him, but sure. And the “Bedouin woman” even has an argument when he refuses to bring Chani.