Having read a few of this author's books before, I was expecting very formal ritual and celebration ideas along with ways of spiritually preparing for the festival. Instead, it focuses on ways of making your home looks pretty and making gifts for people.
I wouldn't say that the actual style of writing in the book is childish, however the suggested craft activities do seem to be geared very much towards children, and a lot of the information given about "yule" seem like the kind of stories parents would tell children before bed-time.
Another problem with this book is that it doesn't really have much religious content, it seems more like a Christmas craft ideas book, and, although no-where does it say that this book is designed specifically for Wicans/Pagans/etc, coming from a best-selling Wiccan author I expected a lot more religious content. As was previously mentioned it is Christmas with hardly any religious content.
I would only reccomend this book really to parents with children below the age of 12ish, as it offers nothing more than slightly tacky ideas of "things to make and do"