Facepalm. The only way the average K/D is higher than 1.0 is if there are more kills than deaths, which can't happen. However, the opposite CAN happen; people often blow themselves up or fall off a cliff, making for more deaths than credited kills. The average ratio is then less than 1.0. If "Misadventure" were on the post-game report as a player with no deaths and who got credit for players killing themselves, then the ratio would always be 1.0.