The toughest part about reading The Martian will be comprehending its massive amount of scientific information. Weir often spends several pages outlining specific technical details, which can certainly be... a lot. That being said, Weir makes up for with a straightforward, funny writing style that mimics the tone and structure of a blog:
I'm going to be setting a fire. In the Hab. On purpose. If you asked every engineer at NASA what the worst scenario for the Hab was, they'd answer "fire." (4.14-15)
In fact, thanks to this easily digestible writing style, you'll probably even walk away from the novel with a better understanding of science than before... unless you're already a science whiz, in which case we salute you.