I LOVED this book! It was the first real survival story I read. I would read it at night and then go to sleep thinking that the world had changed in real life! I liked the authors use of sequence. Whenever I thought things were really a downer, she'd add a entry about skating with Brandon, or Christmas Day; and that would bring my spirits up again.
On the more negative side, I thought that there was a little too much dying/leaving of people I really cared for. I think that the author should've made it so that you either meet the characters that die breifly or the character knew the person a little bit or hadn't seen people in a long time. The death of a few characters you got to know was ok, but by the death of the Doctor (hopefully people who've read the book know who I'm talking about, the the ones who haven't don't!) I was wondering if anyone around them that they knew was still alive!

Overall though the book was AMAZING!!!