The fact that people use it in PvP and know it's overpowered is terrible. It's nice to get a rare item from an accomplishment like that, but if it's going to ruin other players PvP experience it shouldn't exist. Another mistake Bungie made recently was not taking into account that the Queen's Wrath legendaries could be destroyed and turned into easy Ascendant Energy/Shards. It's patched now, but players got a good advantage by doing that before it was patched.