I don't know about you guys, but arc blade is one of the more underpowered supers. Sure it's fine if you are in close quarters and other players can't escape, by most of the time this isn't the case. Players can easily jump back and shoot you. That's why I think activating arc blade should also give you a shield that triples your defense. This will actually make Arc Blade an effective super instead of a joke.
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I think you need to re-examine your blade dancer layout if you're getting owned in PvP. Look up some good PvP builds and examine your play style. A few changes here and there can really make a difference. I for one have yet to kill a blade dancer who wasn't already missing his shields when he engaged me. I've watched them take out a Defender titan with both his bubble and melee shield active. Blade Dancer is NUTS when built properly. Just need the gear to compliment it.