Finally finished the book (well, before the Appendices) and, I dunno, it was kind of a mixed bag for me, at best (
spoiler-filled impressions and rantings follow).
The pace lagged in, especially in the middle, saturated with what seemed to me a lot of mystical hooey and esoteric gobbledygook. There also seem to be some false starts and plot threads that don't go anywhere. I'm particularly thinking first of Gurney Hallecks's conversation with Staban Tuek, a character who says stuff that seems like it might be important later, but the character thereafter never shows up again. Yes, he may show up in the sequels, but I don't think this was a certainty at the time of the book's publication. Also, during this convo, Gurney tells Tuek he heard from Thulfir Hawat that Jessica is the traitor. This suddenly turns into a vendetta against Jessica, but, again, I don't feel like it is sufficiently set up (yes, I'm revisiting this plot point). I looked through the text file to confirm this. Halleck never vows vengeance against Jessica that I could find. Tuek even suggests it's not her he wants, to which Halleck even concedes that "Hawat made a few mistakes." Also, later, when Gurney thinks, after reuniting with Paul, "The she-witch alive!
The one I swore vengeance against, alive!" One, again, no, this never happens; and two, if he did swear vengeance was it before he thought she was dead or after? Anyway, whatever the case, it comes to precisely nothing. Gurney tries to kill Jessica but is told by Paul that she's not the traitor. And that's the end of it, leading me to believe that the murder attempt is just there pad out the word count. If you took this out of the story, it would have changed nothing. It is Hawat who swears vengeance against Jessica but this too comes to nothing, as does the (cartoonishly
evil) Baron Harkonnen's use of both it and Hawat himself. Furthermore, neither Halleck nor Hawat use the slightest bit of reason when suspecting Jessica. Why even introduces this plot point?
I couldn't really connect with the characters. Overall, the tone is overly dour with few if any moments of comic relief or even attempts at humor or lightheartedness. Just a lot of hifalutin speeches. I felt as if any of the main characters died I wouldn't care. But, of course, Paul Atreides being a kind of superman and a messianic figure (not to mention his mother Jessica becoming a super-woman) make that a dubious prospect, even if the text hints at his dying. It all got tiresome after a while and the text trying to describe his incredible awesomeness as a negative didn't really work for me either. Also, the ending of the book was odd to say the least. What a strange final sentence.
There isn't much science to speak of in this science fiction milestone. The idea of a desert planet is still weird to me. Also, if it doesn't rain, where does the water come from, especially the reservoir the Fremen are filling for the intention of making the planet able to support abundant greenery (and aren't they depriving other life forms of it)? Water evaporates. That which goes up must eventually come down. The Fremen might recycles bodies for their water but they cannot reclaim all the water that exists. And the worms? Where does their great mass come from? Why is water an anathema to them? Wouldn't that include water in the bodies of those who get swallowed? I cannot begin to wrap my mind around the ecology of this place.
Anyway, rant over. Overall, I'm a bit underwhelmed and I don't think
Dune is a world I'm going to want to revisit again.