The Vault of Mysteries final boss fight seems to be a terrible place for LFR. I have had wipe, after wipe after wipe and people just don't seem able to follow simple directions. It is not a fight that can be brute forced with no coordination or thought at this stage in an expansion.
I queued for an LFR this morning and up it came, 2 bosses down. You know it is a problem when you come in and the floor is littered with corpses. And I do mean littered. Three to four previous wipes minimum. We buff up, we wipe dismally, 18 people in the group leave. 18!!
We sit around waiting for more people and with 10 people in the group, some fools starts the fight. Are you SERIOUS? Obviously. Nope, not staying around for that people, I'll see you later. *sigh*.