I'm not the best, but getting kills with an auto rifle and going on sprees with it is not the easiest thing to do. Consider the fact that hard light was never considered OP, and that auto rifles are near useless in crucible.
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Yea, if I sucked at PvP I'd probably use one of the worst guns as well. That way I could use it as an excuse and feel better about my lack of skill. I used the strangers rifle for the first couple months of Destiny when PR's were terrible and still managed a 3.0+ KD. When I made a new PSN out of boredom I managed to hold a 6.0+ KD using a lvl 4 vanilla PR and the original sniper. I wasn't even able to use heavy yet.