The fourth installment is tactically weak and more like an RPG. And the overpowered Necropolis faction completely ruins it.
In the fourth game, a single battle offers much more tactical diversity than in the third or fifth.
And, for example, crossbowmen have 50% armor penetration.
But after the strong AI in the fifth game, going back to this feels like a huge step down...
The AI's mental abilities are not a good indicator, because Heroes is primarily a multiplayer game.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!