"Yes! Torture me! Blame me, hurt me with all your might! Let me take your sins, take it out on me and let me Cleanse you of all evil! HURT ME!"
There are many ways of playing a paladin. As there are many ways of playing any other class really. But I think that there are certain ways of playing a "better" paladin too. Paladins are -supposed- to be thick, stupid idiots who will ssschmite any evil on sight. Just like every wizard is -supposed- to be a librarian or at least someone who drags his bag of books everywhere.
Of course, you can play your character differently. That's not by deffinition wrong either. And it's no real use to tell someone else that he or she isn't playing his or her character the "right" way. You can, however, give -constructive- criticism. Meaning to take him or her along and show him or her how it can be done better.
I agree with it being impossible to be a paladin of Nergal though
Wizards are intelligent beings with too many books who will break down and cry if you even point at their spellbooks. Druids are treehuggers who can melt in trees and talk to bunnies. Rangers are fake druids. Rogues are sneaky buggers who liked blowing up things and picking pockets.
And Paladins are thick, religious numbskulls with big swords that hurt.

