IMO, there isn't anything wrong with strafing GV's in a mg armed plane. The damage to the vehicle is accumilative and those 50cals do damage the gv but it may not be obvious.
IIRC, a single .50cal amounts to 1 1/2 pound of ord if it hits a critical area. I've tracked tanks using just the 50's on a Hellcat and even taken out engines on Tigers with the same. Ostys can be disabled easily with .50's if you attack at the proper angle and are a good shot.
So, IMO, whining about the GV damage model, the most detailed damage model in AH, is just sour grapes. Those who are fighting for personal glory in a virtual world such as AH really need to check their life priorities, this is a game ment to entertain, bragging rights should be reserved for real life situations, IMO.