Anti air AA are too weak

Why are the AA so Useless in this game? 

AA portable: Miss even after flare already been used, Short range, Cant track below radar, few ammo. the Vehicle Ammo supply pack should resupply AA ammo also.

Vehicle AA: slow turn rate, quick overheat, cant even kill soldiers, soldiers at this moment can pretty much walk up to the AA vehicle and put a mine on it and win.

Not much hiding place for AA vehicle on the maps.

Balance the AA so we get Late BF2 game performance. The AA balance is ridicilous weak at this moment. 

When you compare Anti vehicle measure at this moment, the Anti air are at 5% of that power.