I used to care about W/l, but since my W/L was destroyed (well not really destroyed, but it went from 3 to 2.15) by disconnects etc when my internet SUCKED...I can't be bothered.
I still do care about winning though, just not the stat.
Well, I play the game to win. I'd rather win than lose. But I won't quit just because I'm gonna lose. However, I do quit when I'm having no fun or late joined a crappy game.
So, I play to win most the time, and don't enjoy losing, but I don't cry after a loss, and I don't use the lame as hell post-game-menu-quit-trick to avoid a loss.