Wiped once with a DI, took him down second try. He's not a particularly hard world boss, but the fight requires teamwork and every single raid member paying attention. The fact that Broken Faith took him down on the second try of the first raid we had ever done on him speaks volumes for the quality of players we have involved.
We have been doing a lot of Molten Core recently as well, and we have one-shotted every one of the un-summoned bosses on at least one raid. Still need more to finish the Hydraxian line so we can summon Majordomo and Ragnoros. Then it's on to BWL and Naxx!