Take into account the players that don't play much crucible and just give up a ton of kills, then don't play again. Their deaths are recorded into the overall KDR but are never made up in the long run. Meanwhile a player that does well in crucible will continue to play crucible and add many more kills into the equation than deaths. Since the former type of player is likely to be more numerous than the latter, the median KDR is driven downwards. I would want to see the KDR at the 75th percentile, the 50th percentile (median), and the 25th percentile. I would bet it would be 1.1, 0.8, 0.4 respectively.