After further discussion and testing we’ve decided to add threat reduction deep in the paladin's retribution tree. Fanaticism will now reduce threat caused by all actions by 6/12/18/24/30%, in addition to its current effect.
It seems like Blizzard is equalizing all the melee DPS specs at 30% threat reduction. Rogues, Feral Druids, Fury Warriors, Enhancement Shamans, and now Retribution Paladins will all have the same level of built-in threat reduction.
The only negative is that this talent will make it very hard for Retribution Paladins to tank or off-tank. So much for my Ret OT build. To be honest, I'm not sure I really approve of building such a large, permanent disadvantage into a talent. It seems against the spirit of talents.
In general, a paladin with talent points is always equal to or better than a 0/0/0 paladin at every task. This holds true for pretty much every class. But now it's possible that a Ret paladin will be worse than a 0/0/0 paladin at tanking. And that doesn't really seem right to me. Maybe the increased damage from the other Retribution talents will make up for the loss of threat.
I mean, Shadowform is an awesome talent for Shadow Priests. Would it still be a good talent if it was permanent? 99% of the time a Shadow Priest will be in Shadowform, but being able to turn it off is a lifesaver for that 1%.
Still, from a pure DPS point of view, this is a massive buff. Now, just kill Seal of Vengeance and give all paladins Seal of Blood, and Retribution will be in solid shape.
Then Blizzard can start work on the harder task: fixing Holy.