I saw Dune in the theater when it first came out. I only had the vaguest idea what it was about. My friends wanted to go, as they were far more into sci fi than I was at the time, so sure, whatever.
I knew we were in for trouble when they passed out a glossary sheet as we entered the theater. WTF?
Despite its flaws, I have to admit... I liked it. I really did. It's pure 80s big hair filmmaking, but I still watch it occasionally, and I still enjoy it.
I only finally read the book maybe 5 years ago. Almost 600 page, IIRC, in the paperback I had... I finished it in less than 3 days. Unbridled awesomeness is the only way I can put it.