Ambitious yawner, but not without merit Well, I watched it all. My rating: ho-hum. Too much CGI, not enough grandeur. Atreides, Harkonnen, and Fremen all fight like Euro-trash soccer hooligans. In the climactic knife-fight with Feyd and Paul, they tussle like high-kicking schoolboys. Actually, all the fights looked that way; barely-rehearsed mob scenes that failed to communicate any sense of urgency. The Harkonnen are bored and laid-back; a far, far cry from Herbert's (and I dare say Lynch's) over-the-top dissipated, jaded, schemers and plotters.
Paul's (Alec Newman) evolution is good; he starts out as a bored court boy with some sense, and becomes a battle-hardened leader by show's end...but he's cold, harsh and nearly cruel in a way I never associated with Muad'dib in the book.
Chani (Barbora Kodetova) was good, but largely ignored in segment III, until the very end. Stunningly beautiful, I expect to see a lot more of her--and I hope as something better than the next Bond Girl.
Jessica (Saskia Reeves) I think was the best. Clearly the strongest actor of the cast. Many of her scenes are so short, but you can really see her being Paul's Mother first, foremost and above all else. Her first moments on Arrakis establish her character as a member of the household, not the Family.
Stilgar just got to stand around and scowl a lot and occasionally let loose some ancient-sounding bon mot ("It is the Way; it is the Law"). YAWN.
Oh, I hear William Hurt was in it too. Not that you could really tell.
Princess Irulan was involved far too much; I know what the director was doing here (Hey, I read the interview), I just think it took away from the actual story. Herbert cast her as narrator, the reader's neutral view into the story, from the point of view of a pawn looking at the REAL power...not a player in her own right. Making Irulan a major character messes with the balance that Herbert struck, of Paul-Chani/Atreides-Harkonnen (If you don't mind me getting too Jungian here). However, her role was well-written, and the de novo scenes that she was in fit with the story.
Lighting was particularly poor...all the actors *always* looked like they were on a sound stage; they must have piled multiple tons of sand to get those dunes indoors. Frankly, STNG has better effects, CGI, locations (i.e., there were some) and sets. And actual acting.
One thing you won't hear me whining about is the screenplay; the director and screenwriter had to make some very difficult choices, and I think the scenes and lines included were good.
A final word: the eyes. I suspect this is the most difficult challenge, technically, for the production. Herbert's "Blue-within-blue" eyes has been a major stumbling block of both productions: how do you get people to have these spice-stained eyes and not have them look like some kind of mutant? Answer: you don't. You go for the mutant look, and let the viewers deal with it. The combination of CGI, contact lenses and lighting that the SF production uses makes everyone look like Bush-Babies...and strangely, not all Fremen have them. I dont' recall Herbert saying the eyes actually "glowed"...just that the sclera and iris were the same shade of blue. In some scenes, you could probably read a newspaper by the light coming off of Fremen eyes. This can't be an easy effect to accomplish, or it would have been done right, 16 years after Lynch's attempt.
That said, clearly a lot of work went into the production, especially realizing the art design. Palaces are beautiful, sets are elaborate and appropriate.