This might have been reported already,
but i noticed a very irritating bug (at least i think it is) in the flaps:
When your flaps are lowered and one of them gets shot,
the flap will actually "freeze" in its position instead of
acting as a gap in your wing.
So, when your flap is retracted and it gets shot, you don't notice it
but when it's lowered, it keeps profiding lift...