Read the last issue today.
Meh.
I realized that this is an alternate universe, but it is so alternate, whenever convenient to the plot, that it ruined the central conceit, to wit, "what if the Marvel heroes were zombies."
Case in point: In the last issue, they eat Galactus, with shots of the zombie heroes digging big pieces of Galactus organs out of his body with their bare hands.
However, it has been [url=http://marvelite.prohosting.com/surfer/galactus/profile.html#PHYSICAL%20DESCRIPTION

established[/url] in the past that the human-looking Galactus that we see is simply our minds' representation of an inhuman entity. Galactus isn't flesh and blood, so there was no flesh and blood for the zombies to eat.
This could have been an interesting book, if Kirkman had bothered to more fully ground it in "Marvel science." As it is, however, it ended up reading more like fanfic.