Yeah I've seen it before. Yahoo games, actually. I used to play alot of Yahoo Spades and if you click a person's name, it tells how many games they won, lost, and abandoned along with a percentage of games left (I imagine just to reinforce the issue). It actually worked as a great deterrant since Spades requires a team of 2 to play. If you saw the person who sat down across from you liked to quit games, you would find yourself another table lol
It's getting out of control...One guy had a mic, and stated "Good luck three on four **bleep**s" (he was mad people were trying to get altars instead of helping him just get kills), even though he was an astounding 0-5 within the first two minutes...that game, and the next three in a row ended up 1v4, because I will not leave a game unless it loses the host.