For WSG I like to semi defend initially. I try to get the other group to charge and retrieve flag. I go middle try to kill the healers on the first pass through so that their fc is unsupported. By the time the fc from both teams is back in mid, I can kill their fc and support ours.

As mentioned with geared dks and healer you should never really die in random bgs. If I can control mid at the same time prevent their fc from ever getting past, we can usually get a win. Sometimes it's not 3-0 but I feel handicapped when I go into the buildings in wsg and I'm generally more effective in open play.