If you read the book, prepare to be disappointed

Rating: 6/10 (5 October 2015)

This film is tough to review. Having read the book and listened to the audio book, both of which were excellent, I cannot write an unbiased review of the movie. Simply put, if you read the book, you will be disappointed.
I am sure adapting a novel to a movie is hard. The audio book was 10 hours, so they had to cut out 8 hours of content. The movie script kept a lot of the major story points, but cut everything that made the book so great. Almost all of Watney's trials and tribulations were cut out of the movie. All his great log entries, dialog, thoughts, especially the science! Almost none of it is there. The only pieces left of his witticism is shown in the trailer. There were some shreds of subplots in the movie, which stick out if you read the book, but none of it made the final movie.
Unfortunately, knowing how much better the book was, I cant give this movie more that 6 stars out of 10. It did not live up to expectations.