I think you can sum this up by two words. Bitch-chan. This anime is gross. Rapey vampires and an MC that is only sticking around to see where the plot will take her. Its sad. I tried to stomach it because the episodes are short but the unlikable characters made that far too difficult.
If you are a man and earnestly respect women do not watch. If you are a woman with a vampire fetish then watch Vampire Knight or something. The harem is smaller, but the plot is better and the characters aren't all disgusting. Its really an "enter at your own risk" type of thing. Kind of like cutting open your head and serving your own brain to zombies. Kind of.