The QBB is a FUSION / SNIPER. Both separate are powerful. Together they should be ungodly strong but its no stronger that a medium impact SNIPER. With charge times should come big damage. That's common place for fusion rifles. Tiny buff needed. Especially in Pve. Should be the most powerful SNIPER because of the long charge time. Makes no sense. It breaks the laws of Destiny weapon mechanics.
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In PvP it's godly. I love it in PvP. In PvE I agree it's kind meh and it's not useful. Hell even on arc burn things it's better to use either my Party Crasher with arc or just pull out ice breaker.