Heroes 6 - Discussion

I thought that all factions were initially equally balanced (perhaps that was the intended design of the game?

You are right. But, unfortunately, in "Heroes VI", the balance is still not perfect. The favorites are clearly visible: Necropolis and Haven. Then come Sanctuary and Stronghold, and the weakest is Inferno. It seems that everyone is talking about how great the undead are because fans of Necropolis are loudly proclaiming the advantages of their favorite faction (I don't know why) and are not accepting any other opinions.