I am in complete agreement with avionix. There are many factors to be had in real life we don't have to deal with in AH. Just in the plane itself, how many here could manage the engine properly, know what all the buttons and switches in the craft they fly do, and know the limits on the aircraft according to the manual? There are more, but getting outside of the aircraft itself, just looking around would be hard. Looking around flying straight and level, that's easy enough, but try pulling hard Gs and getting your head pushed back into the seat, now try looking around.
Then there is the air itself, in the real world you have to deal with wind, turbulence, temperature of the air, prop wash from other aircraft, the list goes on.
Of course, there is a mental problem here too. In the real world, you actually die, and that can get to people, and act differently under that pressure. Also, in AH good sticks are very aggressive, and if they make a mistake, so what? You don't really die. Real world doesn't work like that, I'm not sure how many people would want to try and ride that stall or try and see if they have just enough E to drag the baddie vert and make him stall before they do, based on their AH experience.
There are many more factors that would cause all of our elite aces to quickly falter in the real deal.