My Dark Dark Brute is very very very Tanky. And, especially solo, will out damage a Tank easily. He has Tanked Lord Recluse in Master Ms Liberty multiple times successfully. (Lord Reclise has a huge Energy attack, and Energy is Darks weakness. That I fixed.
But Dark Dark is an odd beast, plays insanely different than any other melee. And people struggle to use it and try to change things. (Which lowers survival).
someone posted they used my build and died all the time. I believe them. Incompetence is a bitch.