It's simple really, just parse in private, see who are the ones dealing good dps, vote abandon, send a private msg to the good dps or add them to a linkshell. It's the harsh truth, but improving at the game is more individual responsibility than it is of the group.

Everyone started off new at this game. If you need to have complete strangers teach you how to play instead of figuring it out yourself or doing some research on your own, you'll forever be stuck in the "bad" category. If you can't do better, just make sure you don't qq about how bad other people are. If you're any good, people will notice.