Everyone says that the 4 heroes turned out not very well. 3DO just wanted to bring something new to the HOMM series, they did a bad job, and they started to be cursed...
All that needed to be removed:
1) The hero on the battlefield as a combat unit.
All that needed to be removed:
2) Movement of the army without a hero (it was possible to make captains who carried armies with them, but moved 50% slower and did not gain experience for killing monsters on the map).
3) Separate Necropolis from Inferno.
4) Remove the Chaos faction (or rename it).
5) Change the defense and attack mode of the Castle (the moat near the Castle should deal damage. Make towers that attack the enemy).
6) Change the textures (of the Castle, both in battle mode and in travel mode. Of some creatures, such as imps and others).
7) There should be more obstacles on the battlefield.
...3DO could have released heroes better than the third...
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html