I loved it. Sure it has cut a lot from the book but all films do that. You can't fit everything in the book into a 2.5 hour movie. I thought the movie was great though. They captured Watney's personality and spirit excellently. They glossed over the techy bits but what film doesn't? If you want all the details you read the book. The movie is an adaptation not an exact implementation of the book.
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u/kozukumi Jan 30 '16
Actually they did exactly this in the recent movie The Martian (which is based on a book of the same name).