I stand with what Heals says. I have played my warrior in xp on bgs after 5.0 and I was very disappointed to get killed vs a half geared priest in a 1v1. idk if this is generally applicable toall classes, but 5.0 nerfed the majority of us and took away more than it gave us (exception for mage blink).
I have yet to try a bg with a pocket healer, but as any class, you wont be killable with a healer pocketing you in 10-14.
Fyi, you do get combat charges now, but double charge is at lvl15.