Yeah, two main points for us also.
1) Tank damage starts off quite manageable, then ramps up. Raid damage starts off ramped up, then becomes manageable. This means that up to the first inhale, one tank healer and two on the raid is enough. After the first inhale, you want two healers on the tank and one on the raid.
2) The enrage timer is VERY tight. We had four enrage wipes, three of which were below 3%; underestimate it at your peril.
In saying that, I think the fight is perfectly tuned.
We didn't run with a shaman (opening up the "Bloodlust necessary" argument), but on each of those wipes we lost someone for well over 10 seconds and we had one member of the raid who was undergeared and not providing the expected level of DPS.
Considering our guild is one of those that runs with strong tanks and healers and slightly weaker DPS generally, I certainly wouldn't say the fight needs any retuning.
Perfectly executed with two tanks (Protection warrior and Blood death knight), three healers (Discipline priest, Holy priest and Restoration druid) and five just above average DPS (Arcane mage, Destruction warlock, Blood death knight, Survival hunter, Feral druid each capable of 5k or more) is enough to down him without Bloodlust - so he's well tuned.
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