Too many factors come into play when judging by k/d, mostly because some people only use known overpowered guns (thorn, last word, hawkmoon etc) or abilities (final round, blink shotgun, change to truth when heavy drops) or will only play with a team and not solo or will only play exclusively as a hunter. I judge more off of how many kills you have with certain op guns, your precision kill ratio (yes they're bunched together with PVE also but most people use different guns in pvp and pve) the lower the ratios the more likely you use crutch guns (thorn, last word HAWKMOON can 3 shot body shot kill as fast as other primaries critical kill) and if you're good on all 3 classes of guardians.