No. Arc Blade does tremendous damage and kills pretty much anyone it touches, and unlike other offensive supers like whatever the Titan's ground pound is, or the Warlock's Nova Bomb, you have an extreme level of control over who it kills, and are even given opportunities to back up out of possibly bad situations. Also, all of the classes are still vulnerable when they use a damage dealing super. I've been shot in the face as I was spinning up the animation for my nova bomb too many times for you to tell me that Hunters are the only ones vulnerable when using a super. You are wrong.