id have to say that the World of Tanks community is by far and large the most civil. i also give them a little bit extra recognition simply because its a f2p game and its pvp oriented. most pvp oriented games ive played have been complete shit in terms of how people act/react.
every now and then you get the one smartass who's running their mouth about how everyone sucks but its far and few between. probably one of the few games ive played where i remember far more positive experiences than i do negative ones