This makes a lot of valid points. The one thing I'd like to point out is the durability of the zombies that are attacking. You do have rigor mortis that locks the body up after death. Zombies that are strong enough to survive this are probably pretty weak.
But are they effected by rigor mortis? Are they just shuffling dead, or can they run and jump?
Basically, what kind of undead are we dealing with?
Or what does the virus/parasite/fungi that reanimated them do to the body?? Will it react to the same things a normal corpse would or will it buypass a few of these things??
I love cracked but they don't always go at things with the same zeal a true nerd would, just sayin