I've been playing since 0.3 and the few times that I tried to fly a plane, I flipped it, crashed or was shot down so I'm not going to recommend sweeping changes.
I'm ambivalent about playing an AA role, I just see it as a role that needs to be fulfilled, like using an Arrow Mech on the battlefield. I'd usually rather be in a mech but most of the time I end up having fun, sometimes it is a chore.
I've used all of the Partisans ( Prime, A, B, C ) and Huit Prime. Since I only use Partisan prime and Huit prime for AA and each costs 51 k and 81 k respectively, my AA career caps at the Huit ( planes go up to the 140k + mark ) so it would be nice to buy something around the 111 k mark.
Almost all of the weapons have a hit detection audio cue, the weapons that stand out are gauss weapons and machine gun style weapons. It would be nice to receive confirmation that my AA is actually hitting an aeroplane at 1200 metre range with it's RAC 2 round because all I have to go on is constantly spamming the Q key to "target under reticle" and trying to figure out if I am leading the target enough, with my paint-stripper gun.
Aeroplanes fly so fast that it would be nice to receive either a visual or audio cue on radar ( changing the colour of the airplane from a red to a yellow arrow would be good ).
It would be nice if AA tanks ( HUIT prime ) could keep pace with the slowest mech in the game ( I don't understand why they have to be so slow ).
The only pilots that I have a problem with are ComeAndSee ( because he uses terrain well and really knows how to fly ) and Rally ( a suicide bomber - "my plane cost less than your mech" as he put it, after simultaneously bombing and crashing a plane into multiple mechs ).
I have a 20 and 0 record on Mirage as Anti Air. At some point I'll buy a joystick and do some plane-raping. At that point I will have a more rounded opinion.