Mark Watney's story was compelling from beginning to end. The book kept me hooked throughout, even during the scientific explanation of Mark's many feats in his attempts at staying alive. The books strongest aspect was Mark's narrative, and it suffered when Mark was not narrating. Andy Weir's other characters were caricatures of people and I especially felt that about his female characters, except Captain Lewis - I felt she was the only other character that was fleshed out like Mark. But the book was about Mark and he was great and you couldn't help but root for the poor guy. Overall, I enjoyed the book and would absolutely recommend it.