Aside from a handful of moments and dialogues that were somewhat intriguing, this entire novel was a major disappointment. Much of this is due to its relation to the Dune series. If this fourth book is an indication of what comes next, I would abandon reading the Dune series altogether.
I felt that this style and this storyline deviated from the previous books and all expectations so much that I wish it just wasn't in the series at all. Some have said that the book's defining moment is its ending. And as I approached it, I had a strong suspicion what would happen, and I was right. Not even its conclusion really made anything more worthwhile.
As this is my first time reading Dune I can't say this accurately but I will anyway: skip this book entirely.