The only game type that KD really matters in is Clash, if you go negative at all then that is bad for your team unless that is you made some key plays such as dropping a bubble to protect your team but then dying when you get FoH, as one example. Other game types KD is far less important, if you throw your body at protecting or capturing zones that can turn the tide of the battle against your enemy. I have always though win ratio is a much greater judge of skill than just KD.