if there are four players in the AvA and two of them aren't axer and dextur you will have some good fights most of the time, unless you are a novice. if it's axer and dextur on they will be playing for score or never leave the ack and that gets old. if you run across players such as constel, 1duke1, maha, avaro, platano, truekill, N7, Tbarone, slash27 or oldman you are in for a fight. if the squads are playing you will not land kills unless you run.
the maps in the AvA are a nice change from the MAs.
what I like about it is if I hear an allied engine I know I need to manuever now so it adds an additional element to the SA equation while at the same time reducing pile-it workload. your hearing is an important sense in the AvA and you have much better immersion in the game.
I like not fighting a spit in a pony and such I like allied vs axis, even with four players on.
the thing is if you go in there and it's basically a 2v2 and you aren't good you will scamper to the safety of the MA because chances are extremely good you will have your head handed to you with very little effort on the part of the handee.
The AvA, where the elite meet, dextur and axer not withstanding.