We have a warrior on deathwing, don't know his rank, but I have yet to see him lose a duel. And he's dueled evrey class, full Battlegear of Valor + AR, he's insane. Tho, I can't speak for Shamans, since alliance don't have them. Me tho, I suck at pvp unless i'm fighting rogues lol.
Got the first peice for my Valor armor set. Now to get the rest, and either Destiny or AR, and get to lvl58 :P Also, i've come to hate the Night Elf's shadowmeld shit..Can't charge when they do that shit