wow,
ok so you're missing blade barrier (huge!), you picked up black ice (waste now that it doesnt affect shadow damage anymore), 2/2 night of the dead (hardely a big deal as ghoul shouldnt be a prioirty when tanking), desecration (only has a 60% uptime in normal rotations and limited use during mobile fights/boss fights), AMZ (gimmick talent only good for progression / niche fights), on a pale horse (most things arent going to stun/fear you while tanking), and some other stuff.
key things you missed out on, 3/5 or 5/5 dark conviction (depending on build), 5/5 bladed armor, reaping (for RP, which is big too), virulence until hit capped, wandering plague is a decent talent thats taken some nerfs and such but is still good for AoE tanking, and reaping which again is a good help for RP.
Ok so yes you can tank w/that, but DK is designed so you can tank any way, but to MT for progression you need to redistribute a little bit. read stickies and stuff from beta forums a little more.