This could all be easily fixed by creating a skill level below Average that has much less effective aim for AI anti-aircraft fire. There would be no need to debate. People who think it is too accurate could set their missions up with below average assets, and people who think it is fine the way it is could keep it at Average and above. What really makes me mad about this is that by making the minimum skill level so accurate, I can't fix it in mission editor. If I had the option to set AI level so that they don't snipe a helo flying perpendicular at 90 knots, 450 yards away using an AK-74, I would take it. Other players could keep their missions the way they are, but I would be able to use it, and I would choose to use it because I've fired a rifle before so I know how ridiculously hard it is to hit moving targets.
Psifire's post in Ground units too accurate vs air targets was marked as the answer