Definatly worgen. The only time their lore actually progressed was in their 1-12 starting zone, but afterwards NOTHING happens further. Except for a worgen liberation front in Silverpine, which only low level Hordies can experience.
Blood elves also get a nomination. In TFT they atleast looked strong and fierce, being able to whipe out large Scourge bases with only a small army. In WoW, all they do is begging for help, and their males look and act way to g**