There is this new dungeon called Bedlam Veil and it was my first time ever completing it. I had one of the best pug groups ever while doing a dungeon on veteran difficulty. It was awesome.
Here's the reason why it was the best:
At the start it was very rough. After trying to kill those crystal monsters that kept flinging light stuff at us, the healer and tank both rage quit out of frustration. Then I and the group leader managed to defeat some of them while waiting in queue for replacements. Another healer showed up but we will still in queue for several minutes then that one eventually left too.
Finally the group leader invited some of his friends to the group and they were the best tank and healers I've ever seen. We managed to defeat the monsters very quickly. The boss fights were difficult but fun. There was lots of mechanics that were obvious like staying out of aoe and dodging stuff. Some of them I didn't know how to do so luckily the group leader explained the basics. Which did help a lot. Then I quickly learned the mechanics by doing it along with the group.
We managed to complete the dungeon. I'm so thankful for the patience group leader had and for helping me out. Also his healer and tank friends were very helpful and patient too.
Some little bit of advice:
Those who rage quit dungeons, it's their loss. Those who stay, help others, and have the patience to complete a dungeon (even after some mistakes), have won.