I would be interested in hearing anybody debate that, either for the book or the movie. Is there more to it than just hunger, sickness, cannibalism, pain and death? Does it bring anything new to the "after-the-end" genre?
No, there isn't much in the book besides hunger, sickness, cannibalism, pain and death. But this complete lack of romanticization is exactly what sets apart from most of the post-apocalyptic genre, IMO.
That said, I'm not sure the book needed to be a full novel. There are couple hundred pages too many of nothing but looking for food and running away.