So surprised by how much I enjoyed this. I was thinking after about 10% that this would be a DNF for me, then the POV switched and I was completely hooked. I'll admit that even though most of math and science made me zzzzz, skimming it gave me enough of the gist of things to keep things interesting. There is humor galore here interspersed with a hell of a tension filled thriller but I think things could have been even more improved if there had been a little more of a finale.
Saying more would ruin it, read it even if you're not a science and math nerd, the indomitability of the human spirit in The Martian will wow you!