Why cant people handle the M12s?

Why are these guys crying about m12s? m12s SMG (Close Range) just snipe em? and its not even that powerful? These guys need to learn how to headshot man. Everybody QQ about m12s i join a game. Use my XM8 blackwidow and this dude with m12s come kills like 2 guys than comes for me. I shoot him 3 times boom boom dead? Jeez these guys need to aim man go to Malte he helps you out.
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