I guess it follows the same format as Peeps, where you chug along for 90% of the book with a pretty decent plot and cool characters, and then just as you realize there aren't enough pages left in the book for this to come to a satisfying conclusion, you suddenly find the book telescoping into a slow fade. You know, like viewing the action from above, with wistful narration that reads like a movie voice-over.
I really like the idea of a book about the apocalypse told from the perspective who really aren't super involved in what's going on, but I suppose it's hard to bring a book like that to a satisfying conclusion, as the characters suddenly get folded up into the larger story. And here we are.