Fantastic movie, all the naysayers are wrong and probably never cracked a book in their lives! Overall, seriously I loved it, this movie brought me right back to the first time I ever read the book. You had plenty of sandworm stuff, get to see a Fremen riding one at one point (and it was cool as heck), the thopters were wicked, the shields were picture perfect, all the characters were pretty great. This movie pretty much got it right. The multitude of visions of the future got a little tiresome after a while, could have done without that, plus Villaneuve has a weird fetish for really loud, distorted noises. But hey I can live with that, the movie was a blast.
No one who isn't a Ben Gesserit needs a reason to distrust a Bene Gesserit. You pretty much always assume they are up to something.