The most UNPOPULAR faction in Heroes 5.

someone mentioned an example – feed an electric Jarl a rune of attack that affects everyone around it)
so think about it, is there an imbalance here or not?

I mentioned it; you yourself, playing as Dwarves, can create such a situation, especially if you have items that increase initiative. Jarls go early in the turn order, and with their wave of fire now, it's even more devastating!
P.S.: you're underestimating the Dwarves; they're a very strong race!:cool: