The Last Word is one of the most powerful weapons you can encounter in the Crucible. So powerful, it can kill you in less than a second (That's like a heavy weapon killtime). Often times, it doesn't matter if you get the first shot off; The Last Word user can just turn the battle the around in the blink of an eye without any real effort.
I've been told by multiple users that the eponymous perk the weapon has is actually bugged. The extra precision damage applies not only to hip firing, but aiming down the sights as well. That means that people who use this weapon are exploiting a glitch in the game to their advantage, which means they're cheating.
Look it up. Last time I checked the Xbox Live terms of service, exploiting unintended elements in a game to your advantage constitutes cheating. I'm sure PSN has similar terms. Bungie is no stranger to banning people for this sort of thing; Achronos himself stated back in the Halo 2 days that the use of the button glitches in that game in Matchmaking was cheating and a bannable offense.
I'm sure some of you (probably the people who use the gun) will start calling me names, saying that I suck or am a sore loser, yadda yadda yadda. But it doesn't really matter; the terms are clear. If you use the Last Word in Crucible in that manner, [i]you are technically cheating.[/i] There's no if's, and's, or but's about it. You are cheating.
You're welcome.
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I have tested this weapon multiple times and there seem to be no defect with the weapon. The precision shot aiming from the hip is far higher than aiming down site. Another thing, the only reason why it might appear that the last word taking you down that fast is because of latency nothing more. Hell times it feels like you got 2 shot by it when its really 3-4, it's just that it's not registering fast enough on your end