Before the Warsong nerf, I ran a Patron Warrior deck that made use of a Gurubashi Berserker (2/7, gains +3 attack when it takes damage). It would synergize with Warsong Commander because of its initial 2 attack, and with only 2 whirlwind effects, it would become a powerful 8/5, which is a serious threat even if the turn does not result in lethal. In many games I played, it acted as if it had Taunt, often becoming the target of removal and silence that would otherwise have been used elsewhere.
I have a feeling that the answer here is going to be that it cost too much and put too much pressure on drawing Emperor Thaurissan to reduce its cost.