I did enjoy this series and visually it is probably the most gorgeous work by KyoAni to date (and that's saying something!), but sadly there were a few things preventing me from rating it higher.

I'm not a big mystery fan, perhaps if I was then I would have appreciated some of the mysteries they solved a little more. That's not to say most of them weren't somewhat interesting, but I wouldn't say I was massively engaged in them and I certainly wouldn't want to watch most of them again. I did like the 4 main characters which is why I wish I could have seen them develop a bit more alongside all the mystery solving and shenanigans. This is probably why Gosick (http://trakt.tv/show/gosick) rated higher with me personally, because whilst it also had mysteries to be solved, enough time was also spent developing the characters and their relationships.

Overall I found the series to be a visual treat and a worthwhile watch, but lacking in areas important to me and leaving me with a slight sense of unfulfilment at the end. It's not a series I can see myself ever watching a second time.