Nice to see someone else who has/had the same issues ranking up as me.
I was at 180 Kill/Death and 82 Kill/Down with a 1.31 hit rate and the rank of Skull.
Die Rise came out and lot's of experimentation, babysitting and play with randoms resulted in a rather swift drop to 105 Kill/Death and 53 Kill/Down with a 1.19 hit rate. However despite kill/death and kill/down being the be all and end all of the ranking system I somehow ranked up to the skull with knife.
Before I was trying to improve my K/D ratios, now I'm playing zombies for the fun of it. If I'm having a terrible game but my team are in a good position then I'll stick with it so that the hours they've just spent trying to reach a new personal high round aren't wasted because a "random" quit on 19/23/26 or whatever other round. Fair enough if your team of randoms don't have mics and aren't trying to work together then quit away, but if you find yourself with a team of two or three who have mics then please have the decency to try and work out a plan. Some of my most enjoyable games have been with randoms who can barely kill a zombie on round ten without spraying the whole corridor with bullets. There is nothing more satisfying than seeing a player who doesn't know basic locations on a map(power switch, mystery box, perks) communicating and functioning as part of a team.