I liked this novel well enough to finish it, even though I had seen (most of) the movie prior to picking it up. It has a lot of talk about measurements in it, which will be off-putting to some and reminded me too much of high school chemistry class and calculations of limiting factors. Still, if you skip some of the analysis of how much the hero needs of what, the story is very entertaining and the characterization of Mark Watney is fun. Yes, I dare say fun in a scifi novel about a scientist likely to starve to death on Mars after being mistakenly abandoned there. His voice has enough humor and humanity in it to keep me reading through the end. I liked the ending better than the movie's ending, even though it is pretty outlandish, and that's all I'll say so as to not ruin it. Read the book before seeing the movie if you can.