The shield block meta is a little troubling.
Spec looks very strange to me. Not an expert on DK specs, but passing up Guile of Gorefiend, Rime, Deathchill, Imp Icy Talons and Tundra Stalker seem like odd choices. And grabbing Necrosis probably won't do much for you if you convert most of your white hits to Rune Strikes anyway.
Unimproved Rune Tap isn't much to write home about, Merciless Combat is a threat boost when you probably least need it, etc etc