The enjoyment of AV, vs other BG's
I'd think its a combination of a few things...

I picked Shaman, then Druids, then Pally/DK's.
Might go Rets, or back to Druids or stick with Pally/DK's in MoP.

I did not pick Catapults, Demolishers, Glaives or whatever.
Nor do I want to play Helicopters, Bomber Airplanes even if they're wow type planes...

So BG's like IoC, SotA, and that sort where a vehicle can one-shot or two-shot an entire team (early in the expansion), and can still with one player in it take out or significantly hurt a 5-boxer....
Well, those aren't ideal battlegrounds.




Once you have a decent amount of gearing, you can run some 10-man BGs with limited success.
You can run a lot of 15-man BGs, as well.
You're still capable of running the 40-man BG's, with gear...

Until you're somewhat geared, anything smaller than a 40-man virtually guarantees your team will lose.
When 5 of the 15 (or worse 5 of the 10) players on one side are geared horrendously...
Well, the results are usually predictably abysmal.




So that has a lot of boxers staring in AV, because they don't automatically lose it.
Plus there aren't vehicles that can take out your team quite easily.

Once you're geared up...
You can do the PvE race, along with the others.
Or you can force PvP in choke points (or at PvE objectives).
So you get both aspects of the game.