Doctor Doom, Unrivaled in turbo mono black??

I've been tossing up whether or nor I can get doctor doom to fit into a my K'rrik deck since it was revealed. While I have more stable win lines, it seems to be an amazingly easier way to push out a turn 1 win. I've seen the arguments that its slow and if you're hard casting it, I have to agree. Chaining an entomb into Corpse Dance or Shallow Grave seem to be pretty reliable in getting him out. I wanted to gauge everyone's thoughts now that the card has been out for a bit.