I don't get it either.
I suppose that's the way they're supposed to look. I assume it's one of the unexpected consequences of video games, which have evolved quite rapidly into a giant industry, creating its own separate genre. The last zombie moved I watched was probably in the 50s, and it was not a mob-creating event.
Same thing goes for vampires and werewolves, and comic book characters.
The societal results of all of it is a subject in itself, and is seen in the development of the phenomenon, from it's beginnings (Hackers, Steven levy, Anchor Press/Doubleday, 1984) to its effect on social adult development, The Dumbest Generation, Mark Bauerlein, Penguin Group, 2008.)
Like rap and other ephemeral irrelevancies, this one seems to be constantly promoted in all forms for the benefit of the huge profits attendant.
IMHO the reason people are fascinated by zombies is for two reasons:
1) One can imagine defending oneself against slow moving hoards of attackers - you don’t have to have superhero strength to do that. You can be an everyday Joe.
2) You actually get to imagine having an excuse to kill another “person’ guilt-free.