the main problem I see with this is that each spec has its own talents that our good to take and not good to take. For instance, as an unholy DK, I would make UA, BS, UB, and SoD as basic talents all unholy DK should take. Theres also Ebon Plague, RoR that are also always talents. My suggestion would be to evaluate them base on spec or just individual talents.
And if you are tanking as unholy and not taking UA you are gimping your raid group, hands down. The math has been done and this is a significant buff to your raid. This is because your going to be/should be the only unholy DK there.
FA is crap if you carry just one druid, if you dont, then its a maybe, IMO find a druid. Along with Accimilation which is very very very situational. IE very few fights where this is useful. Killing Machine should be left out of pure tanking builds. Your crit as a tank is crap (mine is like 5% in my almost full T7) making this talent crap for tanking. hungering cold is for PVP. It has some uses in herorics, but is typically left out of any serious tanking build.
For unholy, I personally love OaPH. Fear/stun durations shortened is a very nice utility talent for both raids and herorics. If you are undergeared, dont use BcB as it can be parried. Descration is useless for raiding or herorics. To many talent points for an ability you wont use often (SS glyph FTW). Wandering Plague is crap for tanking, see killing machine. Ravenous Dead is a nice talent, espically when you use the ghoul to tank with. The pet is meh. Take it or leave it IMO. However, Take the Garg Talent. It is our best RP dump hands down. I know it doesnt add threat, but it adds a good ammount of DPS. AMZ/AMS is a maybe. some people like it, some dont. I tend to use it as it brings some nice utility to the raid. Only take 1/2 of NotLD if you use the ghoul pet.
For blood, its really to squishie at this point in time for it to really be viable. But if you do go that way, dont take Blood worms or Blood gorged. VoTW will give you a good chunk of exp.
I cast the spells that make the people fall over.