I've seen enough aerobatic pilots throw a plane around, what happens in aces high is a pilots last ditch effort to stay alive other then that I see nothing usual that would show its unrealistic.
once you understand the stick stirring, you can realize two things - if a pilot is to low of speed - simply reverse and climb, he cannot match this - someone like ghi waits on the deck in a hurri-2c for you to overshoot then he takes your wing off. If you reverse quickly and reset the fight, you can slow down to where the negative G dive is useless, you can line up if not straddle.
If someone is high speed, you wait until they are completely upside down trying to stick stir, and then reverse, once then nose down and head upwards, simply climb shallow and dive down again - you still end up on their six.
Stick stirring will work if you are to close and didn't take the shot, to fast to actually have time to respond to the move - however if you are far enough away and the person pulls it to quick - you have enough time to react, and adapt.