That gun is seriously overrated. With the recent special ammo changes, you want to conserve ammo for majors and bosses, not waste ammo on low tier enemies which your primary can deal with easily. In PvP it's just a shiny stillpiecer with explosive rounds. Also the exotic perk is more of a challenge to proc than an actual benefit in competitive PvP. Aside from that the gun is really fun to use in PvE.