ok dads.... I'm just saying looking at the Aim (hit percentage) and how much combat time (kills per hour) is more reliable than looking at a 14 to 1 kill death from vulching.
Hit percentage and kills/time can be skewed as well...
Strafe some ground targets, buildings, acks, etc, while you're in fighter mode, and it'll drop. Hunt some bombers and you can bump it up.
Kills per hour is really hard to keep high if you fly in non-peak hours. Share the skies with 90 other people, 60 of which are out of your reach, or a long flight away, while 20 of them are on your own team, and kills can be far apart...
Bail rather than RTB, and it'll improve your kill/time. Or, fight until you die. K/D doesn't help your overall rank much once you can keep it up over 5/1. Going out, killing 5 guys, and piling it into a hill will give you good kills/hour, kills/death, and kills/sortie.
Taken on their own, any of the score facets can be skewed. The overall rank is actually more difficult to manipulate, once you get into the top ten or so.
Personally, I keep an eye on my hit% for a couple of reasons. One, it drives the other facets. Hitting what you aim at results in quick kills with fewer passes, which leads to less loss of energy, time, and SA. That leads to more kills, rather than another flight to the fight.