Not that you are implying the OVA was bad? But I feel the announced 8 episodes seem too short, it's a nice concept, although when I saw the trailer, I got a bit of a shock the way they redesigned some of the characters.
I think it was confusing and could've been developed better if it was longer xD; no offence! aww only 8 episodes? >< I think they should be more! were they redisigned much, I saw the trailer a while back and I don't remember right now |D
I agree on your point there, if I didn't read the sypnosis before I watched, I would have been confused like Inception. Yes, they should make more and yes, some characters were redesigned Youmi and Dead Master have glasses now o.O