My general feeling is that anybody that had a 1.0 K/D prior to the december update has probably seen their K/D fall in the past 30 days. Purely anecdotal, but my K/D falls into a very tight range these days (assuming you throw out matches where ppl are quitting and it becomes a runaway)
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you are probably right, Bungie has stated in podcasts that their goals is to get most people matched so that they average 1.0 KD If you are noticing a drop, it means u are being matched to people closer to your KD