- What are the drawbacks of Heroes 3? (What didn't you like about it?)

Generally speaking, if we're talking about the game, I would only point out the uselessness of some spells and abilities. I personally never used them.

Added 2 minutes later
I personally downloaded a mod that replaces messengers with knights. The balance wasn't significantly affected, and they aren't as overpowered as they were in Heroes of Might and Magic III. I just like them, and that's all.