I love my homebuilt rig because the PC always wins when it comes to pure customization. Case in point: the clever folks that leveraged the character models from Mass Effect 2 and Call of Duty: Modern Warfare 2 and integrated them into the zombie apocalypse, Left 4 Dead 2. Unfortunately, no one has yet to integrate voice samples in game, but holding back the horde with Ghost or having Tali help you get back on your feet is kinda cool. Instead of installing the mod, why not peek at these videos of the gangs in action, courtesy of our friend Matt Pascual:

Fail post my sir. Infinity ward did not create what you call "Zombies". In fact, Treyarch did, and these both companies are separate companies which are trying to see who could win by having people to buy their games and they are also trying to abide the fact that they'll have to copy their work. Thats why you see Treyarch having to add more features in their games.