The banner balance does a decent job, talent wise PRO usually in no better than the opposite team, and they don't use much teamwork so they aren't gaining any force multipliers there. The big problem is that auto balance doesn't balance by class, and PRO players all abuse OP lancer cav builds, so if there's 4-5+ on then on their team usually has a cav stack going on which is the real unbalance, not their banner.
Nerf cav!! make riders take fall damage when de-horsed.