Just recently cleared BRD with my team, didnt find any of the bosses mentioned above as any pain tho, but i ventured into BRD pretty late i guess at 52.

The pain started when i hit the Magmus (guy after the "respawn room" and before the last room where Emperor is!) Took me a while to find out how to kill him, and not standing in the fire coming out from the sides.
Also If u think Darkvire hits like a truck, have fun at Emperor.. Doing 1.5k crits when he goes "red" not sure what the thing he gains is called, he also then go immune to any dmg. After about 5-6 wipes on him i got him down, was pretty lucky tho i guess
i put all my gift of the narru up on the shaman who got the aggro right before he went "red" and spam healed the shaman! And believe it or not, he actully survived! And then it was just nuke till he was down But emperor hits REALLY hard :P

Also managed to do Jail Break at 53! Was pretty hard:]

and PS: don't do the "respawn room" when your tired, gonna end up bad!
Trust me>_>