reached 1650 with hunter/disc in a couple of hours by just smashing everyone (12-1)
then healer + feral/rogue teams came out: half of them won because of them leaving after 20 mins of fight, then 50/50 but barely no rank gain
but my healer isn't that good (backrunning etc) so you might reach 2-2.2k before finding problems
just letting you know hunter's overall damage is insanely low due to 3/4 of time casting steady shot and getting LoSed/meleed/stunned, and stupid CC with high fail ratio, even more than 3v3