There is a reason why this has been hailed as one of the best sci-fi books ever written. I wish I could say the opposite and that you shouldn't believe the hype, but this is an epic masterpiece, with so many moving parts, and captivating characters that you become attached to. If you are into sci-fi, I don't think you'll be able to put this book down.
Full disclaimer here: this is a long book. But, the writing definitely keeps you engaged and there is no filler; there is a reason why this book is long. Once you finish the book you'll understand what I'm talking about.
As a side note, I am not sure what happened with David Lynch's adaptation of Dune. BUT, if it's true that Denis Villeneuve is being slated to make the next film adaptation of Dune then I'll be first in line to get tickets.