If you're directly above someone who isn't trying to move, it is effective. Managed to pick a few kills up in one of the 4 matches I played with it, but overall it is hopeless. The projectiles are slow, have a clear arc and only one shot on direct impact. The blast radius is so low that you can only barely miss the direct hit and the damage value is negligible. It can takes 3 shots, all of which within a foot of the target, to take down the targets shields at shotgun range, and the rate of fire cannot compensate for that. The truth is, it is barely viable in PVE, with grouped up ads control, and useless against moving PVP targets.