Dune is a book read by many, and read time and time again. It is and stays facinating. Taking us to a world far beyond the present time, but yet so similar to our own. Although the desert environement is different from existing desert, and there are no worms here, much of what happens in the book, can be seen as a methaphor for things that have happened time and time and time again, and still do in or own time.
If you are looking for a post about the story, then this may not be the right article, and I can only give you one advice: Read them, all 6 books of the orignal story, and the rest if you want to. They are great books, and will give you a lot of reading pleasure, time and time again.
Dune tells a human story, and although parts are not so detailed as some would want to, it is a human story never the less. Of courage, betrayal, danger, war, finding one self, believing, fighting, Love, adapting, strugling for survival. It was one of the first series of books I read, and it took many years more before I read but If I want to really dive into the universe, I'll go for Dune or The Foundation Trilogy.
The cruelty of the baron, who as can be seen as not only a disgusting person from the way he looks in the film and is described in the book and what he does, can also be seen as evil, and house Artreides can be seen as good. Of course this black and white view isn't really like it may be seen by somebody else. And when reading the book, presumably most people won't analyze it. At school I never liked that part, found that it kept you away of the story. There is the royal surgeon who received imperial training, and thus deemed to be not capable of betrayal yet does so, out of love for his wife, and possible revenge for her disapearance.