I don't think we can complain about the 109s.
Where would they find flyable Emils in enought numbers to make a movie, and how would they afford it?
In Pearl Harbour and Dark Blue World, the same issue happened.
But don't worry, I'm sure the next WWII movies will have the Storm of War Emils
Well, one thing I didn't like at Battle of Britain was the shooting scenes: no tracer or light coming out of the guns, we can only hear noises there.