I guess i have been spoiled with my tanks, the warrior that has been tanking the most for me has t4+.
My brother (pala) tanked HC Mgt for me, he has mostly heroic epics and some kara gear.
In Mgt there are mostly 4mob groups, when 1 is dead before it reaches the tank, were down to 3.
1 caster is tanked by grounding totems (lock or magister) that leaves only 2 on the tank, 1 of them will only be tanked for 4-5seconds, while i reposistion for max range....
Most pulls before the first boss, i dont have to heal at all, unless a mageguard decides to "glaive throw" on me..

GoTN on the tank when you start is also a fail safe (blueberry only )

Ah well, i think its all down to taste and gear.. Better tank = easier with 4 DPS, worse gear = earth shield pwnage.