Seeing this is most likely the end I would like to see rebalanced are.

1.Market place.

Seems like most resources just end up not having much demand baring the last resources.Unit buying seems to have gone too as I never see them in the latest patch.Seems like an interesting concept that never really worked at good as it should.

2.A.I.

The A.I is very passive.They need to be more cut throat when they have a massive military advantage even if a peaceful personality.The A.I also just lets other factions win without doing much to stop them.This make the end game very dull and you're just pressing the turn button a lot until said victory.

The A.I does not seem very active diplomatically either apart from closing borders.Not much trading offers to help their agenda.I never see the Drakkens make use of their diplomactic abilities. 

3.Heroes.

Make a lot more biographies for each faction.Rather than Joe blogs 1/2/3/4 on the same battle map.

4.Unique items.

They should be unique and not available to every hero.