score has nothing to do with skill. You can have a good score, but be a bad cartoon airplane driver. You can be a good pixelated warrior but have bad score. It does hint at some things but nothing for sure. Take for example hit %. If I look at this stat and see a very good one for a pilot, I can't assume that he is a good shot. He might be, but he might also be shooting at many bombers, and strafing many planes on the ground. K/T might be ok, but I know of a few guys who will fly long distances in hopes of running across a small fight or spotting a mission. If they don't find it, they fly home with no kills, but time spent. K/D might be ok, but then again, maybe the guy is very timid, runs from everything in sight. Some people try to up from vulched fields or auger because they are bored. Then you can start to combine...well maybe you are a good shot, but don't know much about fighting. You hope in a fast plane, bnz everything in sight, run from any real fight, and primarily target bombers and look only for targets to pick and vulch. My bet is that being only a decent shot in this situation could net you a good fighter score...and *some* guys who score well indeed fly very similar. These are the guys when you catch up to them and force them to fight, they are average, but certainly not top tier pilots.
There are just so many factors and ways in which score can be influenced, many of them not actually showing any type of skill at all. You can mix and match the stats as you like but you will end up with average (wide range) and skilled players mixed in through all of the rankings. Scoring should be left to the realm as part of the game, not an indication of skill. If you want to find out how you rank up, fight guys who you feel are good pilots. Stats and such might be helpful on a personal basis, as you know how you fly...maybe pick a stat to work on or something like that. But really not that useful when trying to compare it do how good you are. The only way to know that is the old fashion way, go out and get some scalps.