Pretty decent for the most part.
I see Bladed Armor is 1/5, you miss out on quite a bit of AP by not taking that.
Vendetta, that's not a good one. You wont get the killing blow oftentimes, and even then, 6% isn't worth 3 points. Your Blood is too bloated. Drop Vendetta and Will of the Necropolis. Also DRW is you'd like, it doesn't add any threat to you so many tanks don't take it.
In Frost Toughness is all you really need, but I always take 5/5 Black Ice, that will increase DnD/DC damage as well as IT. In Unholy the incresed disease time is always nice (Epidemic) and Morbidity. (Bonus DC damage is more threat, and Blood has weak AoE tanking as is, so lowered cooldown on DnD is nice.)