Because players refuse to acknowledge the great benefits he has brought to the horde due to the poor implementation of his exploits in a manner that players can understand (i.e. it requires them to read). Thus the writers have decided to make him a Conqueror rather than an Iconic Orc Warchief.
He brought the Horde glory in Northrend and has significantly improved their position in Kalimdor. Darn him, that stupid, useless Orc!!!!