In AV (was alliance only, up until yesterday's transfer of the main pvp team)...

My strategy, in any game that was not a mix-it-up, was to head to Stonehearth Bunker and "hold it".
So the horde could not cap that.
Then head over to Icewing Bunker and take that back.

If they were doing any kind of a wipe the alliance and force a turtle type game...
I would hold the area around Stonehearth Graveyard, including recapping that graveyard to give us a mid-field rez point.
But if it was a PvE race, then head from Icewing to Drek's area... and give the hordies a mid-field rez point to give our defense a larger punch...

The defensive approach was definitely better for my team.
The only time sticking with the swarm was better, was boxing 5x resto druids... who only did the PvP honor grind really...