Still new to this game, but I really think that there should be some more punishment for quitting groups. Yes, I also suffer disconnects sometimes, but I get back in if they let me.

The day before yesterday I finally got to level 50, yesterday I went to CM for the first time. Of our two PLD one was geared with godly stuff. The other had a mix of two DL items and crafted gear - also impressive, but still roughly 600 HP below the maintank.
Well, the godly geared Maintank messed up on his first attempt to sneak past something, panicked pulling even more stuff, wiped us and quit without saying a word.
After that, since it was a most unholy time of the day for my J party (6 am in Japan) no new tank came and we cleared the dungeon in less than 40 minutes with only one tank.
So: Although we all had a blast and enjoyed the entire run and it felt totally epic - I still wish that people like our glorious quitter-pld would at least get a bit more than just a 15 minute Duty Finder block.