I've got a similar mono-Black Shadow deck and a red-green-blue-black shadow deck, and both are fun.

4x Hatred is cool but seems a bit risky -how does it play in practice? I rarely put in 4x Hatreds even in a shadow deck- I'd rather use a tutor and add some blue, especially with shadows.

I don't like Sinister Strength here- it destroys any synergy with Horror (and Carnophage is a cool card but, here -?). Sinister is not a very good card in most situations and here, with those Hatreds, even unholy strength is better (esp at 1B), or something that makes your shadows bigger every turn -or that can task those walls for something more useful- especially with 4x Rituals, you're bound to have enough mana later if you don't win in a few turns.

Consume is cool but, with only 1x in the deck -with 4x on almost everything else it's a gamble so why include it at all? You have Duress and Edict -you could do something more interesting with reducing a few Hatreds, a bit more mana and taking the deck to 70 cards, especially with Wall of Souls. 

I like it though -regardless of comments on card choices. It's different from mine, that's all. I'll have to play it to compare.