I think Blizzard balances PvP not for actual quality gameplay but rather to achieve goals in class representation and player turnover. I've been playing some CTA this weekend to cap Honor again for next season; almost every one is filled with people on their undergeared rerolled rogues so they can be overpowered in 5.2. The player base seems to thrive on this. What once was a bunch of Warrior alts in BGs is now a bunch of Rogue alts in BGs, maybe the truth is the average pvper just rerolls to be OP, and Blizzard keeps them around by providing another OP class to do it on.