OP as hell in the Crucible, and then completely useless in PvE.
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Supers aren't everything, plus most of the Titans and Warlocks I see in the Crucible have absolutely no idea how to use a Super effectively. Also, in PvE, you can throw knives into people's heads forever. Nonstop, just headshot after headshot. So long as they die, you can keep going indefinitely. It's the best part of the game.