I loved this even if for my taste there was too much CGI though the battle scenes were spectacular. It's a long film, over 2 1/2 hours and I was really surprised when the credits came up, it felt like I'd been there an hour and a half. The pace doesn't lag and the actor playing Paul is excellent.
I'm not sure why it isn't advertised that this is Part 1, Part 2 will be the second half of the book and there should be a third film based on Dune Messiah. However I think Denis Villeneuve was quite right, it's a very long book with a lot of content and needs the extra time
I read Dune when it first came out and absolutely loved it, re-reading it several times shortly afterwards but haven't picked it up for many years so I can't comment on how close the film is to the book but somehow it just felt as if it had got all the important bits.