Why did I love this book?
I fell in love with Dune because of the worms. Never before had I read a science fiction/fantasy novel in which the world was as deeply thought out and as much a part of the story as the humans themselves. I wanted to know how Arrakis and its worms came about as much as I wanted to know what would happen to the characters.
That package of people and place fired my imagination, and each time I re-read the story [8 times and counting], I discover something more. To me, that is the hallmark of a truly great book.