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3% crit to dps is huge ask any really dpser going from 25% crit to 28% crit is huge and if any of your dps are going OOM then they are not doing a good job managing there mana, don't use a good pot rotation, are not using MP5 consumables or the fight is tanking to long.
http://elitistjerks.com/f31/t17193-paladin_retribution_dps_theorycraft/
Read Section 3: Effects of Judgments. Look at the level of MP5 produced by each class for the cost of 1 judgment. This means more consistent healing and more consistent DPS. Any class is capable of going OOM if they continue to push DPS to the maximum level. It's a fact of being high end DPS, T5/T6/Sunwell level DPS. Sure, for your heroics it doesn't help, but you said "endgame" not "fresh to 70".
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Wrong any endgame pally tanking with Devo. Aura up is full of FAIL. The main reason is because shield specialization scales so well, redoubt is by far the better choice. The only reason you should not use Ret. Aura is if some Ret. pally being a total tard took imp. ret aura. Yes it is only 20 tps but it is 20 tps to every mob hitting you that with BoS, conc., and HS threat should never be a problem.
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Really now? I'm not an expert at paladins at all, but from what I understood, Retribution Aura was one of the cores of Paladin tanking, it is what makes the Tankadin called a porcupine. Retribution Aura would be better to have as a multi-mob tank than Devotion Aura, basically. Maybe in one single-target boss fights, Devotion would be better, but most things you tank involve several mobs at once, so Improved Devotion is simply not going to be justified by the number of times it comes in handy.
First off, there isn't much logic to saying 1.5% DR is good for bosses but not for when there are multiple mobs attacking you. 20TPS is not enough to overcome the threat associated with a level 50 Druid's regrowth (I know, I have one). The threat is negligible when compared to something like consecrate or Holy shield. However, the damage reduction is flat and impassable.
The damage reduction represents an extension of life which is (as noted in a previous thread) the primary job of any tank. Also, taking less damage is extremely important for anything that is "new content" be it your first heroic or your first raid.
The argument for redoubt (at 70) is that it produces shield specialization. Redoubt, itself, is entirely useless at 70, since it is entirely pushed off the table in any 70 tanking situation past your first 1-2 heroics. Shield Spec is useful insofar as a geared prot pally (I've got one that can tank Kael) has around 300 block value (I'm low at 276). A 30% increase is nice, representing 83 damage from each blocked hit. Devotion Aura, at a 1.5% damage reduction/hit, means that it is better than shield spec. whenever the base damage is >5000 damage (pre-armor) devotion aura represents a greater damage reduction than shield spec at the cost of 3 LESS talent points and 20TPS (I put out around 900 on my pally using Devotion Aura).
5000 damage base hits are what you will normally experience from a heroic instance boss, most raid bosses hitting for around 10k before mitigation. Devotion represents a much more significant decrease in damage taken than Redoubt(which is none) or Shield Spec (which, for bosses, is about 1/2 the damage that Devotion Aura will absorb).