The most UNPOPULAR faction in Heroes 5.

The advantage of demons is that they have dark magic... for example, mass dispel to prevent different units from casting spells... mind control, berserk, what else do you need to be happy? Oh yes, -40% to the initiative of enemy units with mass slow and so on... It helps a lot, you know... Honestly, I think races that don't have a predisposition to dark magic are flawed... except for elves, they are strong anyway... That's how it is...
So demons are not a gift either...