This has been my feeling on Dune book 4 - God Emperor of Dune. While it contains several great banger quotes, it leans way more conservative than the previous books to the point that it was difficult to finish. "Oh no, female warriors kissing! ICK!!" and Leto's whole "Humanity _NEEDS_ me as GOD EMPEROR because this IS JUST THE ONLY WAYYY!" are just some examples.
I thought the whole point about Dune was that even the 'good guys' are really pretty messed up people at best and that you should absolutely not be taking moral advice from any of them. See every idiot AI-hater accidentally endorsing slavery by a bunch of idiot psychotics by saying "We need a Butlerian Jihad".
Book 1-3 of Dune are masterpieces IMO. Book 4 was still good although I didn’t enjoy it as much as the trilogy. But I still consider it part of the same overall “Leto/Paul arc”.
Book 5-6 were okay, but didn’t live up to expectations.
To go on more of a tangent, I really thought these books would be impossible to turn into films, but the Villeneuve films are good so far!