I was thinking about the disscussion on zombies and i started looking back on older games and it got me wondering when a developer puts zombies in a game is it because they think its fun or do they just need something to take up time? i have never played world at wars zombie mode on a console, but i have tried the version for ipod touch and iphone and i thought it was pretty darn fun but also extremly easy considering all zombies are one shot headshot kills, they move really slow and you can get the ray gun for 750 points. so are zombies really necessary or are they just a mode thats easy to produce so they are put into games as filler (the flood was just filler in my opinion)?