I've gotten up to 43 mastery level in the helicopter pretty much on my own. I'd occasionally get a gunner who knows what they're doing. I'm pretty happy with the helicopter and the flight physics.
What I'm not happy about is the RPG being so easy to take the helicopter down. Or the IFV/laser painting issues and getting blasted out of the air by everything that locks on once you're painted.
Suggestions for fixing: Slow down the RPG rocket flight speed. I've used the RPG quite a bit against vehicles, and it takes hardly any skill.
As for the laser painting issue, I'm not sure how this can be fixed besides giving an ECM jammer and making the flares work against the incoming missile. And to have a warning that a missile is incoming. As it is now, you're painted, then you're dead.
FIX THE **bleep** TOW MISSILE, PLEASE!!! DICE broke this. The crosshairs do not work anymore, and it does not lock onto anything. So the description of the TOW missile in the loadout menu is completely wrong. Makes you wonder how wrong everything else is when reading the descriptions of weapon attachments.