"Our objective has always been to make our leader boards free of cheaters. It was with this objective in mind that we previously changed the system so it does not award wins or losses if someone quits before the first half is over. However, as of the server maintenance this morning, we've changed how wins and losses are tracked once again. Now, wins and losses are counted regardless of when you (or your opponent) quit the game. If you jump out to an early lead and your opponent quits, you will still receive credit for the victory.
However, to ensure we keep our leader boards as honest as possible, we will be adjusting the skill points awarded to players that get quit on quickly to be lower than a game that reaches the second half. We want to avoid the situation where someone can have two accounts (or a bored friend) and simply jump into games repeatedly, quit out, and rack up wins to advance up the leader board. Hopefully, going forward the leader board will stay honest and wins/losses will be properly awarded to everyone in a ranked game."