Something I've noticed: In AB/WsG/EotS/SoTA my stacks are getting dispelled all the time. Whereas in Wintergrasp, IoC & AV it seems to be less the case, and fulmination comes in handy. Can only assume that it has to do with the nature of the BG/map: in the first ones enemy players are all over the place, whereas in the latter ones it's often more here vs there.