Agreeing with most of your point, however, I have never run retribution aura in a raid main tank setting. Sure, if you've got a holy paladin running it for you, that's fine. Either way, Improved devotion aura is not worth 5 points. I would have to say the preffered MT build over at maintankadin is:

http://www.worldofwarcraft.com/info/...00000000000000

Come 2.3 it will change somewhat. I imagine the points in reckoning will move to combat expertise, with a little more flavor between kings, spell warding, and the new ret talent changes (pursiot of justice and imp jotc).

Smells like perfect paladin tank material then!

I partially agree. I personally find points in Guardian's Favor to be a complete waste, it's basically a holy PVP talent. I find that I do run with devo aura on occasion, mostly in situations where threat generation is far less useful than maxing out stamina/avoidance. But the imp devo points just aren't worth it, we don't have enough spare points to go around as it stands. Ask for a holy pally to be stuck in your group instead (if there's one to spare), as they're fairly likely to have that talent (good for MT group, arena, etc).

Stoicism seems to have little worth for PVE tanking, again seems like a PVP talent (it's rare for mobs to dispel your spells). Spell Warding is very useful to have though, as nearly every boss mob in the game does some sort of spell damage.

Reckoning and 1-handed spec are really useful threat generators. Reckoning is much more useful for MTing something than OTing (in the sense of both tanks being on the same mob, not off-tanking a separate mob), as it won't proc unless you're getting wailed on. 1-handed spec is just about mandatory though, 5% is a huge threat bonus.

I haven't had too many occasions where I missed precision, and honestly I liked having some points in intellect, although I will be removing them for 2.3. Any "free" mana I can get helps a lot with the mana pot consumption.

As far as the actual tanking goes, read the basic guildlines in the first post of this thread. It sums up pally tanking pretty nicely in about 6 bullet points .

For that level of tanking, I think Ret aura is far better, threat is much more of a concern. I haven't tanked anything in a 25 man raid, but I imagine I'd be running Devo there -- but Imp Devo still seems like a waste of points. That's for others to answer though, at his level though I don't think it's a concern.

I guess in a broader sense it really depends on threat vs survivabilty in Karazhan. There's some fights where threat isn't a concern at all and survivabilty certainly is, and then absolutely I'd be running Devo there. I dont think I've ever run Devo in a heroic though.

I'm not saying that you should spec imp dev aura; that's clearly the wrong choice because of shield spec.

Ret aura is great when fighting adds or multiple mobs, but on bosses you're talking at best around 24.7 TPS from it. That sounds a bit high to me, honestly (I don't think most bosses hit at 2.0 speed), but let's go with that. The TPS from kara-equipped people in this thread appears to be around 500, so we're talking another 5% extra threat from ret aura. That's again, at best - no misses, no dodges. (Do parries count for ret aura hits? I didn't think so, but I could be wrong).

Whereas devotion aura improves survivability (according to that calculation above) by a fair amount too. According to the solved problems there, 1 stamina is equivalent to 25 AC. That means devotion aura at base provides +34 effective stamina, and 51 stamina with improved. That goes down as you improve your HP, but at kara/heroic levels, that's about right.

Actually the more HP you have, the more effective HP you get from armor. Actually the amount of effective HP you get is dependant ONLY on your HPs. The amount of armor you have has no effect on how much effective HP you will get from adding more armor. The relative effect of adding armor goes down as you add more armor, but so does every other stat (the relative effect of +1 stam is different when you have 10,000 HP VS 15,000, same as armor, spell damage and almost any other stat,).
Exception would be avoidance, where more avoidance actually gives more relative benefit (50% avoidance when you have 0% is infinitely worse than +50% avoidance when you already have 50%, to give an extreme example). Avoidance though causes inconsistency in damage taken and doesn't stop you from dying to a bust, which is why stamina/armor stacking is prefered. But it actually has increasing benefits the more avoidance you have in terms of how much longer can the healers last.

Well, the value of armor relative to stamina (in terms of +sta) decreases, but the effective HP basically stays about the same. In any case, it's hard for me to ignore a skill that adds 33 stamina for free at the cost of some threat, especially when gear is an issue. If threat is an issue, I guess ret is the way to go, but I've seen more pally tanks sta-limited, not threat-limited, especially early on in their gear.

My problem is our tank group looks like Feral/Warrior/Me/Lock/Tree. Our feral is our third tank and main assist and thus we never have room in group 1 for a devotion paladin. I run ret aura almost all of the time in raids except in situations where I'm going to be tanking something for a long time and reducing incoming damage is more important than threat. I sit around 15.6k armor or so in raids.

I have a question: What does a Paladin have that supposedly makes Leotheras so easy? I've heard that its the Seal of Vengeance ticking immediately after a Human-Demon transition to instantly generate threat and let the Paladin grab aggro. If this is the case, does that mean Horde Paladins are SOL?

Paladins also have ranged attacks such as jugements/avenging shield which makes it far less of a chore to go chasing after him

Ya if you have boss timers you can make it so your avenger's shield will land some fraction of a second after he comes out of WW/different phase. I've never tanked him in the Demon phase - always have a lock do that. But for Demon->human and after WW's, the shield, a judgement, or even a monster heal will usually snap Leo right back on you.