First off; I'm going to say that I agree with it being very annoying if/when things get nerfed just because some people have mastered a gun or ability and then people cry about it and it gets nerfed; often to a level where it starts to genuinely suck.
But:
2:15 - take note of the effective range
3:31 - he hipfires and connects with 3-4 shots to the BODY of his enemy and gets a kill.
Take note that this is a fusion rifle, that has no charge prior to the shot.
Also note that the player HIMSELF is constantly surprised AND at 5:08 is laughing and says "This is too funny, guys - I'm sorry - but this is.. this is broken"
Also: He gets 24 kills - 8 of which are kills by headshot. That makes 33.3% :)
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one the gun is hard to get so it is not like it is a common weapion. like many others said you get that gun you damn well earned it. Also as already pointed out that was a ffa( Free for all) so any one is a target and damn all those clowns ran right at him never even tried to avoid getting shot. the range really was that far away nothing that is drasticly different from any other rifle in the game. I have seen hand cannons with better range. Point being regardless what gun any one uses if you are flat out dumb enough to run strait at people your pretty much an easy kill again regardless what gun you are using. garantee you put him in there with others that know what they are doing you will see a much more even competive game. again useless nerfing not needed.