I don't see what all the fuss is about. I have the defualt FDs installed and I recently made myself up a mission as an escort to Germany and back. I ended up in a dogfight with about 80% fuel. I still managed to drive off a formation of 109s and even destroy one.
It's all about what you can do with the plane
and your wingmen. Never forget that WW2 pilots
never flew alone in a dogfight! There wingman was always with them. Also, dogfights as such were best avoided. The idea was to get more altitude and speed than the enemy and dive out of the sun, picking off a couple of planes before you were even seen, then bug out. Remember this won't be possible in Quick Combat because it's an actual dogfight.

All this physics nonsense...

...really, pilots in WW2 were usually young boys, barely into there 20s. They couldn't care less about lectures and stuff like that. If they got killed it meant they were bad fighter pilots, but there's no such as a bad fighter pilot, therefore if they got killed, they weren't really a fighter pilot at all...get my drift?

What I mean is that if you can't shoot down a 109/190 before they get you and then you go blaming it on the plane, you must suck at the game.

Why do you think you always get told to use your wingmen wisely before each mission? And why do two always peel off when you give the order to attack? Understand now?