I appreciated this movie, but the kid was annoying.
You would think that having been born into a world of decay and cannibalism, he wouldn't whine so much. You would also think that he would know when to be absolutely silent, like when a clan of cannibals is lurking downstairs. His "poppa! poppa!" routine made me want to reach through the screen and smack him.
His behavior would have made sense had he been a suburban rugrat uprooted from his world of peace and security and dropped into a post-apocalyptic hell. But he was BORN into this world, which made his behavior seem false and out of place. I hate stories that portray children as helpless by virtue of their youth alone. I dare say that a kid born into a world such as that one, who had managed to survive to the age of ten, would give most green berets a run for their money.
Viggo Mortensen's character as the wary and grimly determined father working to protect his son alive made a lot more sense to me.