possibly adjusted in relation to gear level? it doesn't seem to scale with other roles. players should play smarter, but lets face it many can't or frankly just won't.
a tanks role is to hold threat against the dps and healer. the ilvl range is just far to vast for a tank to seemingly keep up with their threat generation unless they lay off a bit.
not much i can do about it except time. but at the same time i dont like being cursed at and accused of sucking simply because my gear isnt there yet. again, people forget what is like to be a relatively fresh 50.