Heh I was about to go post here and I saw you were way ahead of me light. Blizz announced they had weakened Ragnaros quite a bit in the patch so it isn't too big of a surprise. The loot on that bitch is nice, 4 tier2 epics... in fact I don't even know what tier that sword and shield are in (should've just made them legendary).
At any rate, it didn't seem like they had much strategy going for them... his health is probably as low or lower than Lucifron's but the 3000-6000 damage fireballs he constantly shoots along with the spawns he creates makes the encounter nearly impossible. That's probably why these guys were able to win with 7 rogues and almost everyone is dead at the end and the only thing he's being hit by is mindflay for awhile (don't even fucking think about respeccing shadow, bitches!) : )
Edit: and oh, it was by Ascent of Medivh
http://forums.worldofwarcraft.com/thread.a...tmp=1#post28350