3 Paladins are awesome. I open up aggro with my prot paladin, gather a few up and then turn my Ret Paladins loose on them.

If you're looking, the paladin on the left is wielding Stormherald and the one of the right, the Hammer of the Naaru.

It's really easy, I've got 1 key bound to a Seal/Judge Castsequence Macro, another to Consecrate/Holy Shield sequence and a third key to Crusader Strike. I think they really need to give Prot Paladins a 6sec cooldown strike... Oh and Devo+Sanc+Retr Aura = Lawl