Honestly there are to many factors that affect KDs to make it a good number to judge skill level. I agree there are some good PVP players out there. But to many people proclaim themselves to be "good". The only true way to find out is to have them go head to head. Not thru random matchmaking but at an actual tournament. Only than could people legitimize calling themselves the best or pro players. I trust Destiny matchmaking about as much as I trust their loot system.