you get points for your kills but it counts as a loss and you don't get a match bonus
its not a bad thing, and you still get the xp, just not the bonus. my win ratio is so bad because i leave games a lot, not just because i'm doing bad, but whenever i have to go somewhere i don't finish my game, i just turn my xbox off
sometimes it's between quitting the game early or breaking my controller because i'm so mad...easy choice