The butthurt is strong in this one.
Prot paladin is no more "broken" than a BrM as far as tanks go. Are other tanks lagging behind? Sure, bears especially. But most of what a lot of un/undereducated players think makes a prot paladin "mandatory" is the debuff dropping ability to allow for so many 1-tank fights. Guess what? Grab a Holy (or Ret) pal, BoP the tank you've got, and ta-dah! 1-tank! That means more veng, means more damage (and heals/absorbs) for any tank. Sure, Prot gets bubble for an extra stack drop, but Clemency on your paladin does the same thing. Hell, even a Dwarf racial is about as OP as bubble...
Prot paladin IS the self-heal/raid-heal tank, but blood DK is not far behind. They simply don't scale as well (healing-wise) since DS is based on damage taken, not Veng. Prot pal's also take more damage overall than most other tanks, ceteris paribus, even though the damage is intake is smoother than most other tanks.
Warriors still have excellent CDs and raid util, BrM/DK have excellent dmg (esp AOE) and bears are still subpar.