Which faction do you like the most in Heroes of Might and Magic IV?

Not always, you might encounter useless spells against neutral creatures, and besides, Haven struggles against Dungeon or Goblin factions:)

Well, I don't know about such cases... But you're right about Dungeon. However, Haven will be on the defensive side this time (if Dungeon is guarding the passage between players). As for useless spells, I don't even know any.