I giggled and smiled through this entire book. Mark Watney is the kind of person I'd like to be if I was ever abandoned on Mars or in the equivalent awful situation on this planet.
It is written as a series of log entries and that flows beautifully. I'd go as far as to call it a travel journal.
Usually swearing in books comes across as unnecessary and contrived but this was like listening to the thoughts in someone's head. Completely perfect.
The science doesn't get too deep and I think that is what saves this book. You get the idea of how difficult what he is doing is but you don't feel as though it is condescending or worse, gets the science wrong by oversimplification.
The Martian is one of the most balanced and entertaining books I've read in a while and certainly in 2015.
Five potatoes out of five.
Should I read this? Do it. This is worth the read.
What did I learn? Human waste can be used for many things but I never want to get to the point that I need to use it.