The Ward of Dawn seems to be severely lacking in PvP. For a purely defensive super, it's not very defensive..
It falls prey to other supers so easily it's pathetic, Fist of Havoc, Arc Blade, and Nova Bomb pretty much can rip through it no sweat. Not even mention Warlock grenades which once they throw it in there, you either have to get out or die. Ward of Dawn needs some serious revamping before it can really compete in PvP.
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If u think it sucks then you are not using it right. Don't be like everyone else and only use the bubble for capture points. Use it to block paths leading up to the points as well. For example, instead of putting the bubble on the B point in Asylum, put the bubble so that it blocks the high traffic hallway between B and the enemy spawn. If you have the Saint 14 helmet, it makes your bubble even more potent. Be imaginative and use the bubble in original ways to confuse the enemy. You are right that everyone loves to use their supers to pop the bubble. Use that to your advantage. Let them waste their super on the bubble instead of you or your team mates.