The book's most glaring weakness, however, is that many of its characters suffer from I'm-going-to-spell-out-precisely-what-I'm-about-to-do syndrome (Harkonnen, in particular, has a James Bond Villain-esque penchant for such speeches.)
Regardless, the book has been absolutely foundational to the genre. Nearly every convention of the modern space opera can be traced back to Dune.
It's a pity that no one's ever been able to crack the book's code on film. Understandable, though, as so much of the action is psychological and the drama internalized.