Villeneuve's Dune doesn't know if it is more like a book, or like a movie

There are authors like Frank Herbert and Philip K. Dick whose books are very difficult to make into a movie. Villeneuve proves this again with Dune. 

It is a nice movie. But it's not quite the book, and it's also not very different or new from the book.

Movies need action, and very often books have deeper messages. Dune the book is a metaphor about human society, about manipulation and power. It has very little technology. The action scenes are difficult to imagine or depict, e.g. the riding (or dismounting) of the worms, or the knife duels with force shields, or space travel based on spice tanks.

Having read the books a few times, the action is very predictable to me. With every reading, you find more subtleties and depths in the book. You cannot put these in a movie, otherwise you come up with a Tarkovski, and nobody watches.

Interestingly, there are quite a few great Philip K. Dick movies, but their secret is probably that they are mostly action, and didn't try to be a lot more. E.g. Minority Report, Blade Runner, Adjustment Bureau, Paycheck.

Dune is much more difficult to transform into an action movie, because the action doesn't make a lot of sense without the metaphors behind, and movie metaphors are different than book metaphors.

 The movie tries a little bit too much to be a book, while also being a movie.