Really it depends on the target - ya, against single pulls or casters/healers then a Prot Paladin will be terrible. But I can for example out-DPS an Elemental Shaman on those elite trees at Skettis.

And a Prot Pally that only pulls 1 mob is doing it wrong... rather like a Mage using Blizzard on a single mob. Yes if you play your class badly then you'll do poor DPS, that's not news