Cracked lays it out the best I have seen. 7 Scientific Reasons a Zombie Outbreak Would Fail(Quickly).
Very funny, and well written little piece.
But I'm not really looking for a scientifically accurate zombie apocalypse.
I just want some reasonable explanation for how civilization falls with all its mighty armies and massive resources. Yet our ten or so idiots in a magical self-repairing RV survive, all while bickering and beating each up, not noticing the machine guns laying all around or even having the good sense to fort up in a remote hard walled building somewhere.
I like the show more than almost anything else on TV at the moment, but there is a reality disconnect that is jarring for a show trying to stay so grounded and realistic.