Lol GG was not nerfed at all in PvP or PvE. You're just using a terrible super. The only thing that was nerfed for PvE is damage resilience on several supers, which didn't really affect PvE too much.
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The super isn't terrible OP however is.
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Tbh I thought was BS when I read it that Nighthawk did less damage than a sniper but regardless GG by itself is horrible in PvE