Half of what Skiv wrote is pure nonsense... I'd ban hybrids; there's no need to ruin the castles. That's what heroes are for – to make the game simple and interesting. And what's the big deal if buildings are constructed in one turn? It would be better if Heroes 3: The Succession Wars had the graphics of Heroes 5, as the third part is the most successful (the others are also good, but this one is the best). And the gods – yes, that's a good idea. But who here needs that? No one will go to the creators' website and tell them what they want to see... I would like there to be an Atlantean race – with moderate technology, not overpowered but not weak either. And everything else should remain as it is in Heroes 3. Also, the computers move faster in Heroes 3; in Heroes 5, you can wait 5-10 minutes. Although, there are indeed too few spells and skills. Another interesting thing about the Necropolis in Heroes 5 is that it resurrects creatures of the levels you defeated from dark mana – that's cool.

Added 13 minutes later
Also, point 5 is complete nonsense... There's no need to break down the stakes. And as for taxes, go play Civilization; there's no need for this nonsense in Heroes; it will only ruin the game, and few people will play if they constantly have to worry about taxes and building walls.