Age Separation for NA and EU servers
My argument is this: kids are most likely to be the consistently immature in game (duh, gotta grow up still)
Yes, not all kids are lacking in manners and such, but I think adding age as a separating factor in matchmaking (like in China) would be good for these two servers.
An adult entering into an anon game with 4 kids (just a scenario) probably won't know the other 4 are children. If the adult is an asshole, and not mature him/herself then its teaching the kids "be a dick". If the adult is an adult, and the kids are asinine, insert x amount of possible bad scenarios.
We as people react to environment, and although it falls on us to control our actions and reactions our standards of conduct are too high for random children