Why does everyone bring up KDR as a measure of "skill" or fun. Is it because it's the only proper trackable statistic in PVP? If your only insults to people are KD then you are obviously an egotistical insecure muppet.
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#Destiny
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There is no reason you should care about KD in a casual game like Destiny. That being said, there's no reason you should be going consistently negative if you have weapons that are considered "overpowered".