Solid 3.5, rounded up to 4 stars for Goodreads rating purposes. 
 I'm glad I finally finished this book. And I say "finally" because even though it took me only six days to read it, I had a lot of free time on my hands during those six days, and I should have finished it a lot faster. 
 Initially, I enjoyed reading the book. Watney's voice was a good choice for the first person narrative, and his humor and determination to live definetely made the book more readable than a straight-laced scientist or someone convinced they were going to perish. The book is told in a series of "log-dates" ala Star Trek (or, I guess, real life space missions), and just as Watney's singular voice starts to seem a little monotonous, the pattern is broken up with third person narrative of the situation down at ground control. As the book progressed, the two perspectives switched back and forth, although Watney remained the dominating voice. And for me, that was what I held issue with in this novel. Everyone who mentions this book brings up that it contains incredibly detailed science, but the problem for me was I just wasn't as into it as everyone else. Sure, it's cool for the first fifty or so pages, and it was interesting to see how Mark was able to do all of this stuff. However, having taken my last chemistry class two years ago, it all went a little over head. And, in all honestly, it got a little monotonous. I started checking ahead to see if the next chapter held a third-person narrative break to mission control (view spoiler)[or the Hermes crew (hide spoiler)]. And actually, towards the end of the book I started skimming each sol entry so I could get the gist of it. In all honesty, though, it wasn't an issue with Weir's writing, just the narrative choice, and I really enjoyed the third-person passages and the dialogue between Watney and various others. It was just one let-down in a really great story line, which is why the book was bumped down to a 3.5. 
 In every other sense, story, characters, dialogue, the book was great. It's a super interesting read, and definitely a great pick if you are of a scientific mind, or in want of a super-engaging read. As someone who isn't that into science and was looking for a quick read at the beginning of the summer, this didn't exactly fit what I had in mind, but it was still very entertaining and had enough redeeming qualities that I would recommend it to others.