It might sound kinda crappy, but right now the ONLY thing Bad JuJu is good for is bottom feeding your team's kills in PvP... if you have it fully perked just follow a few steps behind your squad and sweep up the mess they leave behind. Always lead with a grenade (when you can)... If you run outta ammo, don't reload, just switch to a good CQB secondary until you're in the clear. Wash, rinse, repeat. In PvE it seems kinda useless compared to other primary weapons... I won't sacrifice an Exotic slot for Bad JuJu in PvE.