Is TBN a bad skill?

[Absimiliard]

The only real problem with TNB is its MP consumption being looked at by some as a kick in the DPS, but the reality is that it isn't a DPS loss at all if you're using it properly. It instead becomes DPS neutral by way of allowing you to execute Edge of Shadow or what have you for free upon breaking, thereby cancelling out the potential DPS loss. From a purely defensive perspective it is probably by and far the single most powerful cooldown available to players. I would even go so far as to say it is probably overtuned to a point that is actually comical. Not only does it absorb incoming damage, but it does so after factoring in mitigation from any other CD you may have, essentially giving you the ability to just decide you're not taking damage for the next seven seconds if you happen to be willing to stack it with something like Rampart or Shadow Wall.