She might very well be. Not many Paladins have direct connections to the Naaru anymore, and Liadrin can tap into the Sunwell,which has all the power of a Naaru PLUS huge amounts of arcane energy as well. Turalyon might have fought for a thousand years and led an army of Light, but the Naaru patron that lent him his strength is dead now. He would certainly still be a strong paladin, but only by human standards.