The Burn is one of those instances I get a bit squeamish about doing especially with randos. The last boss in particular can be a PUG killer in my experience.
Since I've been catching one of my characters up on the story I had no choice. I have to say that was one of the better dungeon runs I've played. We smoked it. I don't think it took us even 10 minutes to get to the end boss. We wiped once there but the second attempt went much better.