The Martian still rocks. It has everything that I love in those YouTube video where they walk you through their process of making a cool new machine (youtube.com/watch?v=vsTTXYxydOE&feature=share).
A few times throughout the book, Mark’s plans went out the airlock and he expresses his frustration and hopelessness to the log. Then in the next log, he’s back to working the problem. He decides to survive “off camera” and I think that we missed an essential part of his character.