Whoever told you drk cant tank some 24 man dungeon 40 ilvls after it release is stupid. All 3 tanks can tank all savage tier raids without breaking a sweat as has already been stated. Someone who says drk 'cant' do X content is full of it. If you want to talk about meta compositions and getting 99% on an illegal parsing site, then you start to have a discussion about min maxing the tank role and drk slips down a notch, but drk is fully capable and playable at any level in its current state. If you rank the tanks it is last, but that is a completely different statement than what your informants have been telling you.