The main problems I had with the road (film version):
1. Mobs of Hicks/Rednecks. Beyond cliche, Period.
Generally people suppose that these types of people would still alive because they are more equipped to live after an apocalypse. Maybe... but none of the ones I grew up around could get along very much. They liked to drink and fight... some of their fights lasted for more than one generation. Second part, most of them were good hunters (in the movie they dont hunt... they ride a crappy truck searching other broke down vehicles for people to eat.
Third Part. Most of the cliche hicks are so dumb (in the book or movie) that it is nearly impossible to believe they are still alive at the point where they are encountered... I guess they just make better villains than tetanus or the flu.
2. The kid in the road has grown up in a world where he has never met or seen another human (besides his father) that is NOT actively trying to EAT him. Yet this kid is a whiny little brat who seems to only want to do nice things for his potential predators.
I believe that it should have been the other way around, the father, who could remember the "GOOD" world would be much more likely to help other people or share than the kid.
For reference to how kids behave when society has broken down see LIBERIA (Vice TV has a nice 8 part documentary on their travels in 2009 liberia: cannibals, drugs, prostitution, murder, child slavery, rape etc. all the norm in that society. One of the good guys (former General Butt-Naked, now a Evangelical pentecostal) helps out while on vacation in Nigeria by alerting authorities to the fact that a local food vendor is serving human. He uses the internet to prove his cannibal credentials and they believe him and arrest the vendor selling "pork ribs".
<sigh>
WPD