RV-6 and L-17B Navion since 1990, 3006 hours logged but currently grounded because of a medical (blood pressure issues and an undiagnosed episode of anaphylaxia). Ran an air museum for seven years, so I have hours logged in all sorts of a/c from G4s to Stearmans, AT-6s, Fouga Magisters, and MiG-15 UTI. Even have some right-seat B-25, C-47, and UC-78 time.
I think the standard 'stick back, nose up, stick forward, nose down' mentality prevails in the game, but as others have already said, the environmental aspects of feeling the aircraft and having natural forces acting on you simply isn't there, nor can it be in anything but actual flying.
I find the visual controls to be awkward, instead of turning my head to look at something, I have to input a keystroke or use the hat button on the stick, which takes away from the physical input to the controls, if even for a millisecond. It's one more thing your mind has to think of and process, whereas in reality your head is on a swivel.
I've never flown in a combat situation, so I can't comment on that, but I agree 110% that most of the things we do 'in-game', without actually shooting, would get us killed. On the other hand, flying 'for real', within the limits we've learned as real pilots, will get you killed really fast in the game. I think this is the hardest part of the game for me, because I'm naturally reluctant to put my virtual airplane into a situation that I couldn't get a real one out of. It's like closing the door of your car when you know the keys are locked inside, you know what's happening but you do it anyway...
J