note: I have only read up to Ch 5, so the review stems from only those chapters, and hence I have not bothered with a numerical rating, since I think it'd be unfair to (somewhat) arbitrarily assign a number rating to something I'm not completely familiar with.
My interest in this series came from two things: 1. the series is complete, and 2. I'd just finished reading 'Dance in the Vampire Bund' (which I highly recommend) and thought vampires were totally cool.
As others have stated, there's not a whole lot to like aside from the artwork. The mangaka vilifies all males aside from the moronic main character (typical of most titles in the harem genre). This guy in particular has 0 redeeming qualities, even less so than Keichi from 'Ah! My Goddess' and way less than Minato from 'Sekirei'. There's a fair amount of fanservice, but far less than you'd find in the aforementioned Sekirei. Most of the characters are cute, but a bit young, so the fanservice does nothing for me in particular. The only character I seem to like is the adorable young witch. Cute little kids are my weak point (since I have one of my own ^_^).
Simply put, this work does not stand out in any of the genres it is associate with. If you're looking for lulz, a plot, compelling characters, and fanservice, I'd recommend you look elsewhere. Honestly, I don't plan on finishing this series. You're better off looking to another series, but if you MUST read one that's complete, I s'pose you could have a gander at this one.