Coming from the Battlefield series, I personally find it a bit difficult to pick up and play helicopters immediately.
I do understand and appreciate that the control scheme is far more in depth and that it would naturally take some getting used to, however I think just the addition of an "invert Y-axis" on the air vehicle control page would make the game feel a whole lot more natural to players coming from other FPS's.
Right now I'm trying to teach my brain to unlearn 4+ years of heli flying "the wrong way round" and I'm sure I'm not the only one