Just did castle thorn and it was the most bugged dungeon ever, the other complained about lag, did not notice much myself as tank but get that its an issue weaving tight.
High dps group with healer so no issue at all in normal, it felt pretty easy and light on mechanics, but the last boss was messed up.
First the blood balls was very hard to target, so hard we spent a long time before we understood they could be accessing them. I noticed that before too, the scythe outside on the second last boss was also very hard to hit, same with shards from the healer.
And the last boss bugged on phase two so we had to wipe and it worked the next time.
Two left as in logged off as they could not leave group, could also not leave dungeon finder, I had queued for wrong dungeon and is had been spinning while we did the dungeon.
I say its the most bugged ever, I expected the finder to be down as all wanted to try the new dungeons but not this mess, once we gotten into the dungeon thing test to be smooth outside none knowing mechanics

And the launcher had failed to download the patch it gave an warning and wanted to repair the game, restarted it solved the issues.