The first book was awesome. I think the second book was ok, but disliked dead characters getting resurrected for apparently inane drama. The book I finally stopped at was whatever one it was that the main character turns into a telepathic immortal sand worm and was abjectly awful.

I think they're making the right choice. Dune has some amazing world building, but the series got muddled down into whatever drug fueled fugue state and stopped being interesting.