If I am not mistaken than bards have an annul song, and rogues can backstab for insane amounts well over 1k damage per hit. Now yes, I know that rogues abilitiy is only situational, and that bards are limited as well, but bards, if played well, have more utility than any other class in pvp. They can definately get around a damage shield. Drain mana? Dot kite? I realize that these things would take a long time, but damage shields shouldnt really effect bards that much. I am not completely against a lower in DS's in pvp, its just I dont see the point really. Most if not all classes have ways to avoid it. It is part of the game, and part of the classes utility. If people play smart than they can easily avoid the problem.
By the way, most often than not, melees will lose to casters in pvp, unless said melees have good resists and can resist the majority of the casters spells. Thats just how it is. Unless of course it is an inside zone. Anyways bumping damage shields down a bit or keeping them the same wouldnt really effect most of the people anyways, since a very small percentage of the population is pvp.
Jinxat.