And the funny thing is: The Netherworld forces aren't even "vastly overpowered", as some whiners have it. In fact, their main advantage is that their power is concentrated, but in sum total, they're about equal to the human realms right now.
Which is not small deal at all, specially considering the morale advantage and the repeated charges. I'm not complaining, but they are certainly not as fighting humans, and we are not quite fighting with equal strengths. Not we should either.