This has been discussed. Recently. Search and read before posting.
Originally Posted by pessadilla
Since 3.2.2, TPS has been proven not to be an issue.
I'm curious what has changed for this to be true. When the great SS nerf of 3.2 arrived, my threat went into the toilet as Unholy. The only thing that's changed recently is more examination of DnD rotations that used even on single target tanking. 3.2.2 itself hasn't done anything to change the threat generation of UH except for the Subversion change, but by most accounts, that's not a huge change for tanking and still rarely taken.