Looks like a nice and fun spec to use, but you do know that HS is just a normal attack that requires weapon, thus it is mitigated by armor and such. So I think armor penetration should be needed for this spec as it would not be doing as much damage, and by the way, for optimal DPS go in blood presence since you really need the 15% increased damage moreover then haste in unholy presence.
I like that spec, and gonna try it out when I am upgeared with a good 2 hander. I wouldn't try this spec if you got a bad 2 hander no, only if you got a great one like the titansteel destroyer or demise, but otherwise then that it looks like a fun spec to try out, it is more a one-on-one spec rather then a AoE so that is rather disappointing so you won't be getting high damage output then a HB spec since now of this patch, CC isn't that important anymore and everyon AoE the shit out lol. But good try nonetheless.