my best game in AV was defending with about 5 or so others. You get one good healer with your 5 man and set up in the courtyard behind the tree off to the side. Put down a earthbind totem in front of the entrance to the courtyard. Let the melee'rs keep the alliance out of the two towers and burn everybody that comes thru the entrance. Occassionally you will have a fight on your hands but if the healer/healers are doing their jobs you wont lose. I got the highest HKs with that defense. And the game did turtle but we did win, finally.

Im a big believer in "good offense is your best defense" type strategy. Takes the alliance awhile to figure out that theres a boxing group defending, especially when your hiding and they cant see your CL coming at them. lol.