A build that's worked for me 'til now. I had problems holding threat, but I'm fine now. And I have put a lot more into Expertise than I had before - I did an extensive regemming last night. I generally lean towards mitigation, though, and after trying some reforging and more regemming, I decided I'm really not willing to sacrifice all the stats I'd need for any noticeable increase in haste.
The Seal of Insight bonus to my health would be nice, though, and I can swap something in for the Battle Healer glyph if the need arises. Like I said, next week will be very telling, one way or another.
That's the point though, you're not mitigating, you're avoidance/stam as far as I can tell. You soak up a bunch of big hits then avoid a few, making your healers always second guess what healing they have to give you.
Really, at least if you don't want to do the Haste thing (which is not for everyone, requires a bit faster reflexes/good rotation), you should at least try Mastery. Make that damage intake much smoother and much easier to predict for healers.
You do know the style of gear you have about one of the worse ones you can have as a Prot Paladin in MoP ? Mastery or Haste are both far superior options.
I'm sure I mentioned this build has been working fine for me. I actually block or avoid entirely most of the hits I have coming in, and with the T15 bonuses it's very rare I'm taking a string of big hits unexpectedly. To say nothing of the array of defensive cooldowns I have available.
I like my build. It works for me, I'm happy to play the way I am now, and occasionally I even get complimented for being a good tank regardless of my gear. Also, I HAVE mastery. I just don't respec for it, 'cause to me it's reducing the chance to not get hit in order to increase the chance of reducing the hit by 30%.
Maybe it's because I stick to LFR as the highest difficult I reach and for Normal or Heroic raiding it wouldn't be enough, but so what? I'm not telling people to mimic my build. I'm just saying what works for me.
I have no problem trying out new seals, techniques, whatever, but I'm not going to rearrange the way I tank just because some people insist it's inferior. Sorry.