User blog comment:Zombiehunter115/What is the next "Zombies Mode" gonna be?/@comment-1263839-20140523155533/@comment-1263839-20140523164214

Extinction is the second time, it may have an objective, but it's like saying that Origins and Mob of the Dead are technically not survival maps. I don't think either of them are terrible, hence "underperformed", especially since neither have caught on and made thousands of fanboys drool.