Honestly I think classic could literally do with about a 10% boost to all enemies health and armor for a bit more challenge (maybe 20% after Act 1). Seems pretty balanced.
The problem with tactician is rather then add more enemies like in D:OS EE they now have +50% health and armor. But the game isn't balanced for it and so weapons and armor quickly become outdated too fast because of the exponential increase from levelling up and moving into higher areas - which is something I hope they eventual fix and balance.
