Thorn is a 2 shot headshot kill on low armor warlocks and hunters. It is a 3 shot kill even if all shots are body shots. It also has the 2nd highest rof for a handcannon after TLW with the highest damage per shot of any handcannon. As if that wasn't enough, it doesn't let enemies regen health and allows you to track enemies through wall. There is a reason why almost everyone exclusively uses thorn in sweaties.