I was excited to see that we have AA in the beta but it quickly turned up to be disappointing. In ARMA 2 when an AA hit a helicopter it would damage it really heavily and you could see the pilot struggling to land. It was pretty awesome to watch (and its the reason I had helicopters on almost every mission I ever made). Right now every time an AA missile hits a helicopter it instantly disables it and the heli just drops to the ground, which isnt very realistic (or fun to watch).
I would love to see the epic heli crashes back.