It's besides point whether the GV can shoot down the AC. The point is that by being forced to fight the AC, the GV frequently gets screwed in the GV game. Even having an AC dive on you gives away your position, let alone any damage he may or may not do. Remaining concealed until one strikes is at least half the GV game, in my experience. Very different than air-versus-air, where concealment is not a factor.
Whether the dominance of AC is "realistic" or whether it is ok because AH is primarily a flight sim is besides the point (though both of these things are true). The point, in the end, is that if there is a significant number of people who are happy with GV-only, and willing to pay for it, and if it can be done without disturbing the main arena for the rest of the players, then why not?
Remember, none of us want to be in a position where we are insisting that others always "play our way", right? I am fine with current MA play; we are just asking for something extra, for those days when I just want a GV-on-GV experience.
TDeacon