So today I did heroic MgT, and all and all I'd say it was a fun challenge. What was not fun, and incredibly frustrating was, having to change a dps to kill Priestess.
For adds we had the Shaman, the Rogue, the Warlord, and the Hunter. Our DPS was a Mage, Rogue, and a Hunter. And we simply couldn't do it. All mobs aside from the Warlord cannot be trapped, and trapping him was insanely difficult.