Because Zombies in black ops 2 was a big let down, they took out some of the fans favorite perks for no reason when they could have clearly been used for a great purpose. For example PHD flopper would have been a great way to deal with the exploding zombies and all of the annoying lava. Dead shot daiquiri would have been very useful for headshot only gamemodes. Without these perks the game feels incomplete and a step down from black ops 1. And survival is no fun anymore so at least put in a wonder weapon other than the raygun to make survival more fun. If you do this treyarch you will make zombies more enjoyable for all your hardcore zombie fans :D