Learn to adapt, if a gun is "OP" and you know someone has it, stay back with a sniper or scout rifle. If a gun was nerfed and is no longer working in your favor. Don't use it. We didn't make this game, we don't really have control, just adapt. It is what it is learn to change your game play style a little and try a new approach.
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My advice is leave the damn guns alone and learn to appreciate their qualities and how to use them yourselves. Otherwise - please leave the game completely.
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If there is a ridiculously overpowered weapon in the game you have two choices. 1.Demand a fix for the broken weapon. 2.Take advantage of the situation and use that weapon until it gets fixed. Then switch to the next broken weapon. ;)