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Here's what I'd like to see added (or changed/improved) to make the game much more appealing to me:
* Add at least one more resource.
* Bring back gardens, mills, etc.
* Strengthen offensive magic and half of the other casting magic, allow learning some spells (at least the first levels) in the old way (from the Tower of Magic), and allow casting the same magic continuously.
* Do something about hero training and secondary skills (I don't really like them now).
* Make a normal town window (like in the previous Heroes 1-5, even if it's not 3D).
* Finish many elements (hopefully in the full version): show army growth, show how many days it takes to travel to a certain location, increase the cost of conversion, and reduce the cost of some buildings (especially in wood and ore; I'm playing one map – it's been a month, I have 100,000 gold, but I can't build a 3rd-level Fortress and a building with a Champion in the main castle!).
* Remove the ability to buy the entire army available in other castles from a single castle! (What's the point of city teleports then?)
* Reduce the speed of about 30% of the units (I'm tired of clones with the same speed; almost all units reach the end of the map in 2 turns!).
* Since each unit can attack walls and (most importantly) the Main Gate, make a moat with liquid around the entire wall (don't leave a free passage to the Main Gate), and make the gates lower and raise (like in parts 2-4).
* Add global spells: air scouting, summoning a ship, walking on water, or a portal.
That's all for now. I'd like to know what others feel is missing the most in Heroes 6 and what they don't like!