The book is good! Really good, even!
But nobody has to read it! If you know anything about space opera in the last 45 years, you know plenty about Dune. You won't be lost. Hell, a good chunk of the movie will seem derivative (hey, isn't that Avatar? Hey, isn't that Star Wars? Hey, isn't that The Wheel of Time? Hey, isn't that Game of Thrones? The answer is yes, yes it is).