I like the class and the fact that it is the only armor that doesn't have a skill to raise block or defenses, because it doesn't need it. Life carving, blood rites and shadow allow you to keep your hp up while the enemy's drops like a stone in the ocean.
One thing I agree with would be updating some of the skill animations. It'd be nice if, since we have had them for a while, it had more than one possible animation for 'attack.' It also be nice if Doom Blast had the animation changed to the 'doom bomb' that Sepulchure used. The stance could also use a little change too.
All in all, updated animations and a new stance would make the armor better.
PS: I do agree that using some of sepulchure's animations would make the armor more fun to use. Also making it so Doom Knights stop killing themselves in PvP would be nice too.
@WarMongerRave: Hit them with 'Shadow' first, then you'll know the meaning of the term 'overpowered.'