Let me preface this by saying that I loved the movie of The Martian. I went into it completely expecting science fiction suspense, and it was one of the funniest films I've seen in a really long time.
So far, the book is much the same (thank goodness!). It's got quite a bit more cursing than the film (which bothers me, but oh well), but so far that's the only stickler for me. Mark is a sarcastic, deprecating narrator, but he's smart and witty. I'm trying to follow the science, but since I'm the type of girl who gets low Cs on science tests (when you're allowed to use Google), it's slow going and most of it goes over my head.
This is slow going so far because I'm kind of easing myself back into reading for fun. I grew up listening to stories when I went to bed, and I've been listening to the same "Emperor's New Clothes" collection since I graduated from college. I decided to listen to Fellowship of the Ring, but since I always fall asleep before the chapter ends, I'm also reading along. So my main priority right now is reading a chapter of Fellowship a day, and this gets fit in between that.
Sorry Andy Weir, but Tolkien will always be bae.