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A hero-terminator can only be created in RPG maps or in regular maps of size L-XL. And even then, in the second case, you will need to hire creatures of levels 3 and 4 for development, as at the very beginning, the hero is incapable of anything without an army.
In the upcoming storm, the hero was indeed made worse – in his own campaign, it was still possible to somehow get by with the army and the barbarian, and there were no difficult battles, but in the final campaign, he was constantly killed first; he didn't even have time to move because of the terrible morale, only the Hand of God saved him.
In WoG, the commander is too overpowered; even heroes from the fourth game with a fully upgraded warfare skill tree and the coolest artifacts would envy him. On the last difficulty level, I walked around without an army until about ten creatures of level 7 accumulated in the castle, and on large maps, I developed him to the point that he had several thousand hit points, damage so high that he could take down twenty black dragons with one hit (and he attacked twice), always moved first, etc. In general, they just poorly implemented a good idea.