I tore through this book in 2 days, so there's no doubt I enjoyed it. Some of the NASA lingo and chemistry/physics talk went right over my head, but it wasn't really necessary to understand all of that to appreciate that Mark Watney was a brilliant, resourceful guy. The crazy lengths NASA go to to try to rescue the stranded Mark from Mars are absolutely crazy and expensive and I have no idea if that's how it would actually go, but I get the impression Weir really knows his stuff regardless. The only part that left me wanting a little more was the end. Without saying what happens, the book kinda just...stops. I would've appreciated a little bit more of a resolution. This bumped it down from 4 stars to 3, but still a solid read. I recommend it for anyone who enjoys science fiction. 
 Side note - I totally was picturing Matt Damon the whole time I was reading, but luckily I think the movie casting was spot on for this one. I'm curious to see how the movie will translate all the complex science-y stuff onto the big screen, but in many ways I almost think this story is better suited for the movies. We shall see!