Well, my personal "peeve" with the AI is the lack of what really separated experienced pilots from utterly green rookies -
situational awareness.
A totally green pilot put into a combat aircraft will barely be able to do more than cling to his leader (and losing sight of him often enough, though). Such a pilot's attention is completely occupied by keeping the aircraft in the air and not losing sight of his formation. You can read that often enough in veteran's memories - they almost never saw the enemy aircraft during their first air combat.
Experience is gained through flying missions (and coming back in one piece
) and the first thing that improves is the situational awareness. Suddenly the pilot does have more and more routine in flying the aircraft so that he can keep most of his attention outside, scanning the skies for contacts or other unusual things. There are varying grades of situational awareness, there are pilots with little and pilots with a great load of it and often training or experience have nothing to do with gaining it, but only after a certain amount is gained other aspects of flying other skills improve (such as aerobatics, combat tactics or even shooting skills).
This brings us to what is my main "booo!" with the AI - it does know (always!) when an enemy aircraft is on its tail. There is no way to surprise the AI, once you get into shooting position it will start "waggling" from left to right so badly, that I get headaches after watching it for a while. There is no tactics involved - no sharp break turn, no steep dive, just that insane "wag the wing" stuff.
My 0,02 € ...