There is no way that heroic MgT is tuned to T6 players. It is an instance where execution of strat, rigid DPS orders and proper CC come into play more than anything other heroic. It is harder than any heroic but it is not tuned for T6 geared people, ti is just harder to outgear. I have had a party where the tank and healer were in full blues with 1/2 epic (priest in primal doomcloth) with one T5/6 ish geared DPSer (me, warrior), and 2 kara geared ish DPSers.
I hope they make heroics harder, just not stupid hard like they were originally in TBC (first boss of heroic old hillsbrad, anyone?).
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