Yes it is, that is how rng works. It is random and does not always give out the best to the lowest player in the match. I know I have tested that theory by not doing anything but running around and dieing for dozens of matches and out of all of them I got whites and blues, not a single legendary or exotic or shader not even a mote of lite or strange coin. So it does not do it as much as people like to cry it does. Those that cry are those that expected that just because they did the best they should be entitled to something and that is not how it was meant to be.
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I don't "cry" it does, just saying that through my experience this phenomenon happens more often than not. No reason to start a heated debate over a video game.