Here's another strength of the magic factions: they have access to magic, unlike Barbarians, who are limited to melee attacks and bows. A mage hero can resurrect their units, but what can a Barbarian do?
Magnus, respect. At least someone understood me! I'm already tired of writing about this in almost every topic. I won't repeat myself; everyone already knows what I mean. :D
Barbarians are not very diverse. That's the essence of what I'm saying!