I understand it's supposed to deter people from basically rage quitting a dungeon, but some people either can't comprehend mechanics or just don't have the gear to get past some areas.

I just finished a failed WP, the timer was at 45 minutes and we were still on the 2nd boss. Finally the healer decided he had enough after the 5th or 6th wipe on it so she left, then the other dps who couldn't carry the blm left then I was about to leave when somehow more people showed up.

Obviously the blm hit add members not thinking it was his fault for us not being able to kill the adds quick enough so that's when I left. I try to queue again and I have a 15 minute timer.

First off, I thought the 15 minute timer was only put on the first person to leave? So now everyone who leaves a DF group gets a 15 minute timer? How is this a positive thing?