While its possible for a team to climb up to rank 6 in 3v3 early on in the season, the real challenge is staying there throughout the season.
I don't really agree with this "win-trading mentality" as I looked over the Nelth 3v3 ladder, and the top teams are all legit.
I do agree queues can be hard, I know they were hard on Sargeras too. But we played many excellent teams for wonderful games (we still went unbeaten that season, mucho proud) and as such, Neltharion should only be MORE active than Sarg was.
Anyways, rank1-5 on 3v3 is always a better measure of skill than random BGs, as long as the games weren't win-traded. It is a bracket in which the clueless get absolutely destroyed, and so will NEVER stay on high rating (again unless they win-traded, and those will be banned swiftly).
Also: Alliance noobs is a fairly biased thing to say, seeing how Alliance are, as always, dominating ladders...