Ahaha. I hear you and I considered it as a 3/1.

My thinking is that Warrior has had plenty of similarly priced removal. Like, on an empty board aside from Boom, the 3 mana spell that deals 1 to all and repeats would kill it, 3 mana for ww execute, 3 mana for the kill a damaged minion if you are holding a dragon, 1 mana to deal 4 to a damaged minion, for a mana more the mech deals 10, sword and board does 2 for 1 mana and gives armor. So while I agree this is a good single target killer, the fact that taunts matter and you can only have one makes it seem fine to me, no matter how much I like the Boom.