As I read through the reviews if you esteemed members of OSA, maybe I can sum it up as follows:
For those of us who like "traditional" zombies ala Walking Dead or George Romero, this movie was disappointing and a bit slow.
For those of us with kids, it was an enjoyable and acceptable "family horror movie."
Fast zombies scare everybody, but if you really think about it, they would be fast in the beginning. They don't get tired, they will run until they literally can't anymore, which will be longer than you.
I love walking dead and romero, AND I liked WWZ.