I totally understand. The later books get... weird. They definitely didn't have the same depth to them that Dune did. I did enjoy the story of
Warning, extreme spoiler
Seriously, this ruins like 2 or 3 books.
Leto and his role as self-proclaimed God-Emperor, as well as his relationship with the Duncan Idaho gholas
I basically drank Dune from the original book all the way through Chapterhouse: Dune. I even went back and read the prequel books, which, while nowhere near as good as Dune, I did enjoy the backstory to why things were the way they were when Dune comes around.