Problems with Heroes of Might and Magic IV.

The editor for Heroes of Might and Magic IV, in my opinion, is the most convenient of all the games. Perhaps Heroes of Might and Magic V and VI have more features. But in terms of comfort and the ability to instantly test the changes made, Heroes of Might and Magic IV is top-notch. I remember how I struggled to test a large map in Heroes of Might and Magic V. Brr...
The problem with Heroes of Might and Magic IV, in my opinion, is mainly one thing: the AI is terrible. And it doesn't support HD format either.