Since I'm almost done with the series (just waiting on Eclipse for the last episode), I thought I'd write my take on the whole thing.
Story: What story? While we end up seeing background story for all of the characters, the feel of it all remains the same. The over-all driving plot point is a bit thin, and by the end, I found myself wishing there had been more.
Art: The animation is great. There are a few jerky moments - most noticeable when Itsuki starts using martial arts - but the majority is clean.
Sound: I love the opening theme to this. Otherwise, I hardly noticed the music at all. It fades into the background as the action progresses. Could be better, could be worse.
Character: One-dimensional cardboard cut-outs, propped up and made to look cute. No, really. The only thing distinguishing them all is the system of magic they use - which stays true to the actual tradition it was based on. Otherwise, you could super-impose some of them over each other and not notice a difference.
Enjoyment: Despite the lack of certain factors, I still found myself enjoying it. It's light-hearted, and where it's not, it tries to be endearing. The whole thing is meant to be taken with a spoonful of sugar, and is best served with a warm cup of tea.
Overall: It's saved from a mere "Good" by its replay value. It's so off-the-cuff and relaxing that you could throw this in, sit back, and relax the day away to it. In fact, I did. Twice.