The quests are bugged and can't always be finished, especially in a group session. It's ok to grind there if you are really bored, but I'd stay away.
My advice is to wait until you see the quests being fixed in patch notes.
It bugged for me when I could walk through the doors and kill the 2 emerald guardians that I was suppose to go upstairs, geta quest and then come down to kill. They don't respawn.
I've also heard that if you are in a group, only one person can save the half-naked chick and get credit for it at this time.
Just a heads up. :)