It wasnt' designed for Crucible use.
Its for Gambit and PVE...where it is a very powerful (if unspectacular) weapon. It makes short work of the taken, bosses and mini-bosses.
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It can work somewhat well against roaming supers, need a bit of distance but malfeasance can actually work fairly well in pvp, used it and ikelos to get to thorn and ended up using malfeasance more
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I use it all the time in Reckoning 3, melts Taken
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I mainly would use it against bosses, I tend to use thorn more for adds