Game mode also has a large effect on said K/D analysis. Clearly someone that devotes 100% to rumble and does very well has a different view of "skill" than someone that plays objective based modes purely. But I agree overall with what you're saying. The "meat" of the community resides around .8 or so, the above average is 1.0ish. Everything 1.5 and above (average across game modes) is likely a highly invested and very knowledgeable (from pvp perspective AT LEAST) player.