Even so, I'm quite happy they've chosen to tell a different story than strictly recounting what happens in the comics; it keeps it fresh for the fans of the comic, keeps us guessing what will happen at any time. Each medium has its own benefits and limitations, and it will be good fun to see how things vary as the story progresses.
However, I really hope they don't try to go after the scientific explanation of what causes the zombie plague as a main theme. They're zombies; so what? Other than a throwaway line or two ("They say it started in China..." or "The CDC's last broadcast said burning the bodies might lead to the contagion going airborne..." I do not need to know why the dead are up and walking. I just want to see how everyone reacts, that's all these things are ever about. For me, at least, this is a historical truism.
The Anne Rice vampire books were fun for the first couple, where they solely dealt with the effect of becoming a vampire on a human psyche. Even the vampires didn't know why they couldn't die, they just knew the rules for avoiding death. As soon as the story focused on trying to explain vampirism and turned away from the psychological and sociological aspect, the books became really uninteresting. Monster Island is another nice piece of interesting, creative zombie fiction, and it too chose to focus on the human aspects of the effects of a zombie apocalypse, and even one zombie who manages to retain his conscious mind. Then in the subsequent books, a technical explanation was attempted, as well as extrapolating other happenings which might occur if their rules for zombifying are true... but who cares? It's not what zombies are about! I don't want to have an author rules-lawyering himself through what may or may not work within his proposed pseudoscience. Just show me how humans can continue to be awful or heroic to fellow humans, even while their world falls apart.