If we go by this (higher is worse)...
...the specific builds are anything other than Electric Melee, Titan Weapon, Dual Blades, Psionic Melee, Staff Fighting, and Broadsword--that works out to be 16 of 22 powersets. I would usually expect an edge case to be a tiny fraction of the possibility space, not 72.7% of it. A similar usage of the word "edge" puts the majority of the US population in the edge states east of the Mississippi.
Edit: It was an actual edge case which got Brutes nerfed in the first place. FWIW, I think Tankers should be left alone at this point. Just give teams a reason to have Brutes along.