I have to say upfront that I am not a big fan of Frank Herbert. I thought the book was just OK. I read the first 4 books, but it was kind of a struggle. My interest level dropped with each book, and with book 5 I gave up after around 100 pages. And this was during my younger days when I was more of hardcore scifi book reader. If I try today I may not finish the first book.
I thought the movie had some good moments but overall it was pretty bad. I did like both of the Sci-Fi Channel miniseries.