There are lots of small imbalances on different maps due to changes from one spawn to another. A good example is that Last Refuge and Twisted Meadows have creeps in some positions, but not the mirrored position on another side of the map. This means that an Undead player using the Rod of Necromancy will not be able to do the same creep pattern from one spawn position that the player would be able to from another.
I think that cleaning up some of the different spawns on some maps would improve the consistency of play, and be a generally improve the health of the game’s balance slightly.
Are there any other a-symmetrical map elements that blizzard should take note of while making balance changes?