The flight model isnt simplified, but it has lots of strange behaviors, most of them related to stall modeling and some flight data is incorrect.
Oleg(the main dev) said, that they will adjust all FM:s before it will go gold.
One bad thing is, that the pilot has too much power moving control surfaces on fast speed. Theres little or no compression.
The gunnery is altough much much better than in AH. Theres no hit bubbles and you need to hit the actual wireframe.
That makes for example the dead 6 shooting very hard, if you try to hit wings or buff motors. You have to be in perfect trim and concentrate fully on your shooting to get some damage to your opponent.
I can grab g2 with pods and shoot long burst from 6 aiming the engine on buff, but sometimes they all miss with inches. It has very cool track playback, so you can watch those tracers flying soo close but not hitting.
Also the effects from hits make you feel, that youre shooting bullets and not lasers. Critical hits make very cool smoke cloud and if you shoot some big target ahead of you, you sometimes lose the sight completely as the smoke blocks it.
Theres no hit flashes from MG:s, only small particles blowing off, which cant be seen from far. SNiping is for that reason almost impossible, as it should be, when you cant verify hits with meteor flashes.
Il-2 will definetly give new, fresh ideas to flight sim genre. If it would have MA like AH, it would be very competitive with AH, maybe even better.