The reason being, everything else has been nerfed. And the range is pretty insane, the speed is WAY TOO HIGH, etc
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No, it really doesn't need a nerf. Pretty easy to shut down if you make wise use of your abilities. Envenomed smoke will make them panic just long enough to either get safe, focus team fire, or a simple snipe to the dome. Other options are fist of havoc, golden gun, trip mines, really anything with bullets or explosions. Tl;dr -- shoot them with bullets instead of being a wussy.