True, but there are some who rage quit because they don't want to ruin their stats! A lot of the time I find it is skull knife/shotgun ranked players that rage quit more often than single bone/crossbones/skull players because they're scared a few downs will cost them their rank or screw their stats in some way. The ranking system was an interesting idea for zombies, but it belongs on multiplayer as zombies is more about survival to high rounds, not showing off stats and ranks like multiplayer is. It's causing way too many problems including this rage quitting issue, also it's not a good judge of whether someone is a good player or not due to hacking..
I second reverting back to Black Ops I leaderboards, much easier to tell if someone was a good player or not/hacker/etc.