Tank specs scale ridiculously well with the new stat bonus armor.
It has gotten to the point where Blood Death Knights and Brewmaster Monks can take on 2-5 people of equal skill who aren't in a tank spec.
Tanks have no place in PvP, especially not in this state. Bonus armor should be a stat strictly found on max-level gear, as it completely ruins all competitiveness from lower-level PvP brackets.