I believe that the leave counter should be displayed as a percentage out of the number of matches played.
Over long periods of dedicated gameplay it is inevitable that a situation will eventually arise where a player must abandon a game.
Eventually these occasions could begin to accumulate until the leave count reaches a very high number.
Say if a player had abandoned 50 games, that would be pretty bad. However, if they had abandoned 50 games out of >9000 the direct impact of the 50 missed games could tarnish their reputation rather heavily. For example if they wanted to join a particularly competitive clan that required no more than 10 games on the leave counter to join. Having the information as a percentage would prevent discrimination against longer term players, and provide a more comprehensible representation of their likelihood to rage-quit out of a game.
Also, we should show the percentage below forum avatars.