If you’ve read those 3 then do yourself a favour and read God Emperor of Dune because it really sets everything that happened so far and later on into much grander perspective. It’s the most enjoyable of all because it’s so grand and weird but that’s required for what it tries to say. Later books can be treated as optional since they don’t really bring that much to the table.

Dune Part 2 made changes to the source material that are just amateurish no matter where you come from. Whatever happened with Chani at the end of Dune Part 2 was a low point because conflict due to lack of communication is the laziest thing writers can do and ultimately boring. I also disliked how conflict with other noble houses at the end was hand waved away by Gourney radioing into space. Having those 2 changes at the literal end of the movie leaves a sour taste without anything to help the situation.

There are also incomprehensible changes like skipping Paul’s integration into Fremen society, including taking wife and children of Jamis or having a kid of his own. It makes Fremen into 2D sand people caricature. Having Stilgar become some intelectually challenged country bumpkin is another change in the same vein.

I loved Dune Part 1 because it was faithful to the source while remaining accessible and beautiful. In Part 2 I felt that Villeneuve betrayed original vision and made a movie that would sell well rather than have cohesion to the story being told. At times it felt like Villeneuve made a Dune movie for people who hate Dune.