Director: Denis Villeneuve
Well, whatever opinion I have will be wrong, by everyone who watched this movie. And, especially, if you read the book.
I've only read Dune once, years ago, at the recommendation of RHPT and StevenH (and probably Lauren, if Steven was pitching it). That said, I thought it was a singular reading experience. My inability to return to the book has much more to do with life being short and me doing other things rather than my lack of love for what I read.
I think people who read and grok Dune are changed a little after, maybe in tiny ways, but a bit. I cannot imagine approaching a Dune movie without having read the book - I know watching Lynch's version without having read the book led to me giving up 20 minutes in. But after reading it, I was like "oh, yeah, this is maybe not the best way to do this, but ok." Similarly, before reading the book, I could only follow the SyFy Channel TV mini-series version of Dune so far before I was like "y'all are on your own".
So - I have no idea what those who didn't read the book took away from the movie currently in theaters and running on HBOmax.