I saw it a couple days back. Good popcorn movie, but very little time to do any character development with such an ensemble cast. The other main gripe is they hype the film as being scientifically plausible in 20 some years when it's set, but the opening sequence has flaw regarding the thickness of Martian atmosphere which changes density several times during the movie to make plot points possible. Kind of jumps the shark for the climax in what is possible in space, but the zero G scenes were amazing. I think they must have filmed in a plane doing parabolic flights. Doesn't look like wire work or CGI.
There is a clever callback reference with Sean Bean who I didn't recognise at first without a sword and beard.
It's a lot of book to fit into a couple hours. I hear folks who read the book first enjoyed the movie more. Good to see on a very big screen...