This documentary is contradictory in nature -- on one hand, it is fairly exhaustive as far as the influence of George Romero goes. With Romero himself here, his films individually analyzed, Tom Savini on hand... and even Boyd Banks. It also covers the world of Max Brooks pretty thoroughly.
I have to give them credit for covering zombie walks. I think this film was right on top of that, catching the phenomenon in its early stages, and probably encouraging more walks to sprout up. Appleton, Wisconsin started theirs in 2008, just about the time of this documentary...
But there are also some glaring holes. Why only Romero films? Why not Fulci or others? Why only people from Rue Morgue and not HorrorHound or Fangoria? And what about "The Walking Dead"? I suppose it might not have blown up until after this documentary, but when they mention zombie comics and neglect to mention TWD, there is something wrong.
So, as good as this documentary is, it is not complete... if they re-edited it and threw in maybe 10 or 15 minutes of footage covering the topics they missed, it would be far more worthy of recommendation.