I've done with x4 Blood DKs with Paladin Healer (another person). All toons were in PvP gear.
The first part is probably the hardest - just keep moving him in wide circle around the pillars to prevent a large buildup of the mines he throws.
If you can avoid the bulk of the AoE damage, it isn't too bad.
The rest of the bosses I had no problems face rolling.
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