I give this manga straight tens. You know why? Because it's the best damn Manga I've ever read. It's so well written and the characters have so much depth to them. Of course, there is the occasional bit of fan service, but, in my opinion at least, it's purely for comedic purposes, for Tsukune acts in a very humorous manner when in those situations. I have read and re-read all available chapters multiple times - it's that good. Anyway, This series is damn near perfect: The right blend of action, romance, comedy, and character development.
All in all, this manga is a must-read. SO GO READ IT :D