Its not only just consecration. Throw a shield spike on the paladins shield and stack block rating gear, retribution aura and blessing of sanctuary. Single pull most instances through SM:Cath without a problem.

Mistakes are also a LOT more forgiving as well with a protection paladin than it is with a mage. With a mage if you get stuck, nova is on cooldown or you run out of mana the number of mobs that would hit you would eat through the cloth like nothing. With a protection paladin you have time to see what is wrong and make adjustments while your being pounded on.