K/Ds are easily inflated, there should be a bonus for non fireteam players as its extremely easy to win with one. The way they have your combat rating is pretty accurate at how much of a good player u are as many noobs have it low while getting high kds by camping, noob tubes, supers, etc The destiny servers pick up a surprisingly detailed amount if data per match, so I'm sure the devs could come up with the best solution. The tier rewards are a great idea though, Its always a blast playing against skilled players than newby players even if u lose