Ahh, where do I start? Well first and foremost, this is an OVA, not a movie. Please remember that. If you're looking for a fleshed-out, character growth-type of story/show, this isn't it for you. Now, if you're looking for a quick-fix of anime, this is it for yah.
Let's start with the story. The producers did a really good job fleshing out the main points of the story line, and drawing viewers in. They also did a pretty decent job telling the story in about 33 minutes. Of course, because there was only 33 minutes, the story seemed extremely rushed. I found myself asking a lot of questions at the end of the OVA. But then again, this is an OVA. The story gets an 8 from me though. I hope the good reviews of this OVA will give it the green light to be developed into an Anime. It definitely has the potential to be one of the best out there.
Art. This is my favorite. The crisp drawing and colors really caught my attention. I'm a stickler for art, and I can say this. The art really enhances the story line and the character's persona. Not to mention the fact that the animation is pretty freaking awesome too.
I gave the characters an 7 because they all seem very interesting. I'm quite interested in finding out Frankenstein's story and what he was doing while his Master was "asleep." I'm also interested in Rai's story (obviously because he's the main character), and how he got to where he is now. Despite the interesting story's that the characters may carry, they all seem to lack any unique personality. Rai is the typical, "cool-headed, bad-ass Master." Frankenstein is the "obedient, loyal, second-bad ass" character and the others are your typical "weak female, nerdy/geeky friend, and hot-headed 'I want to save the world'" characters. Of course, it was an OVA, so I guess you couldn't see much of their personality anyway... But still, if it does develop into an anime, I hope they do away with the un-original personalities and give us something with more substance.
Overall, I really enjoyed the OVA despite it being extremely rushed. As mentioned earlier, I hope that the producers will be given the green light to develop this into an anime. The story line seems to have a lot of substance, and the art/animation is exceptional. Plus, who doesn't need a good Vampire anime?