Change The Rules For Leaving Dungeons (aka Why People Insta-Quit Castrum Meridianum)

[Valkyrie_Lenneth]

If players are intentionally playing poorly to screw the group then sure. You can already report and/or kick people who are AFKing or coasting.

People get upset if you talk to them about their performance, because "it's just a game you elitist" so I propose the game automatically penalizes people who play under a certain threshold. If you are doing say, half the dps or less of the highest dps in the group, you get booted from the instance with an hour long penalty. That give you enough time to figure out what you did wrong before queuing again.