One big miff I had with supreme commander is the static AA. One team in multiplayer games just guard bombers and air wins every time.
Totally unrealistic.
I feel the same about the fog of war in ashes of the singularity, I mean its a thousand years in the future, radar, shooting lasers and rockets, but can't even see like a football field away.
I'm not much of a programmer but mabey 10% of map would be something.