My entire point on this is that vengeance is a hammer.
It isn't precise, it doesn't really scale correctly.

So what has happened is that bears have had their armor dodge and health dramatically altered to not make it too good for them, avoidance stats are discouraged, and tools the tanks had that would have scaled with AP are now too good with vengeance.

And they keep hammering at it instead of looking for a good alternative.
They did this with replenishment. Instead of just getting rid of it because it was too good they kept trying to balance all the classes around it, and it wasn't working.

A hammer is great at doing one thing. Vengeance will be the same, it will be great at one thing. The problem is, tanks have other tools and vengeance is going to break them because they need other kinds of tools and the devs applied a hammer to them.
WoG has been hit hard. Without Vengeance propping it up, it is a waste of a GCD. I have seen this first hand. Shor/Shield Bash, savage defense, etc... they all were designed to scale off of gear so the more AP you had, the better they were. Vengeance added to the mix completely threw them out of synch.

The tool itself has a major issue in that once you build a threat lead, there is no worrying about threat at all. No one will creep up, ever. Because at max stacks it makes your TPS way beyond what it needs to be. You can go afk and not care at that point. It isn't precise, it isn't doing what they want, it is screwing up other abilities. They got tons of feedback saying precisely this in the beta and they stuck to their guns instead of backing off and saying "well, it couldn't be balanced, it gets to sit next to spirit link and wait in the corner until we can get it right"