I tried it last night for the first time. I thought these things were bad enough in PvE, but holy heck. These things are useless junk in PvP. I couldn't get a single kill with one. NOT ONE. Multiple hits didn't do a thing. Sometimes, these things would just happily bounce past players like tennis balls. Even when they did score a hit, it was nothing more than a mosquito bite to the enemy players. I don't even see a point at all to even having them in the game when they are this weak.
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I did once. Got a double out of it. Probably I'll use it more on CQC maps.