I'm a total fan of prot paladins, if I have to group with any other tank I already deem it a lesser one.
Anyway I have met a few good paladins that I group with often now and one of them is quite amazing, he had an average of 2.3k dps over an entire culling of stratholme heroic run. Which was more than all dps but me.
So how overpowered is your prot dps?