The weakest castle in Heroes of Might and Magic IV!

Death – overpowered (5 vampires and a hero can easily harass and even capture cities for 4 game weeks!).
Life – is this an army?
Nature – I disagree.
Haven, as well as Dungeon – are weak on Large and Extra Large maps.
Fortress – only on Medium and smaller maps.

Yeah, I agree with you now... Dungeon and Haven are only viable on Large and Extra Large maps.
And as for Nature, it's like Fortress – you can play them on Medium and Small maps.
But regarding Life and Death, I'm not sure anymore... I think they can be considered for development on larger maps, even though one castle is the weakest and the other