Here's a faboo interview with Drew Goddard, the screenwriter (and, at one point, the planned director) for "The Martian" about the process of turning the excellent novel into an excellent screenplay. He hits on a lot of the decision points I noted in changing the story the movie (and which, by and large, I agree with).
Originally shared by +Kate Testerman:
Spoilers galore, but very interesting if you've read both the book and seen the movie.
How “The Martian” Went From A Best-Selling Novel To A Blockbuster Film
Screenwriter Drew Goddard explains to BuzzFeed News how he transformed Andy Weir’s beloved book into a script, all the painful cuts and MAJOR SPOILERS ahead!
What's the novel name??
The Martian (by Andy Weir).