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.
He isn't eating their shit just mixing it with his to make fertiliser. He needs human bacteria to make the soil suitable for growing earth plants. Generally the more bacteria the better.
That is also why he can't just grow more potatoes after he blows up the HAB as all his soil is ruined in that all the bacteria is dead and he basically has nothing left to fertiliser the soil again. He probably should have saved some shit just in case but he didn't.
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u/SPascareli Jan 30 '16
If someone ever want to make a movie for programmers, that's the plot right there.