Tank Mitigation vs Tank DPS.

[Taika]

So tenacity does not decrease damage at all, its a broken stat? :f

As explained many times in this thread, while it does reduce the damage taken by a few % when compared to a gearset without tenacity melds, the difference is not significant enough to allow your healers to heal you any less, which is why it is not recommended. Your raid healers will want you to boost your damage instead, your dungeon healers don't care one way or another.