Sorry dude, I think we have different problems.
I'm not complaining about players who play badly. That's fine with me (edit: bad players annoy me too, but they play actively and learn, so it's quite different from my perspective). But if you actively decide not to play anymore, you should get a penalty as soon as you leave a group. I'd rather have bad players in my group than non-players.
I see that in every group content. So it's nothing PvP specific, it's just that I've been increasingly upset about this lately.
Other games manage to use leaver timers. GW2 also manages this, but not or rarely at the right moments.
Why is a player punished because the queue opens, but it just doesn't fit anymore? But in the game another player is allowed to behave as he pleases?