A lot of people are bored of the zombie thing. Not me. For one thing, the appeal of straightforward bad guy artificial intelligence is undeniable: they walk towards you, walk some more, and then paw at you like a drunkard on the subway. There are no cover mechanics to worry about, no flanking, no need to do anything other than walk and paw. And anyway, aren’t they sort of a Metaphor? For death, or how you don’t like spending time with your grandma because she’s slow and she paws at you?
I suspect Run, Fight, or Die! is a metaphor too. Possibly for death. Maybe for boredom.