Bo3 just came out, everyone is just racing to get master prestige and be the first to complete the zombie Easter egg, give it about a week or 2 and people will start coming back.
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That's what I liked about this one so far. The 4 player coop campaign, and once you finish it you get nightmares mode. Which is the campaign with an alternate story and reality where the zombie virus got free. It changes all of the non-mechanical enemies into zombies, and they do use guns.