A little over a year ago, I wrote an article titled The Left 4 Dead Effect. It explored the awesomeness of the Left 4 Dead franchise and why it resonated so well with gamers. In an industry of true-to-life (or attempting to be) graphics, massively online multiplayer and soul-crushing plots, what makes a quirky game like Left 4 Dead so appealing? Even though it has hardly any of those features? I couldn’t quite pin it down before, so I just left it at the unexplainable Left 4 Dead Effect.