I think that Wicca and Witchcraft For Dummies is an extraordinary book. It's full of credible information, solid suggestions for Wiccan practice, and engaging stories to bring Wicca to life for the reader. The author clearly presents the depth, beauty, and wisdom of Wicca.
Unfortunetly, the author didn't seem very interested in what she was writing. Even her intro was discouraging. I did like the history chapter though.
It was somewhat informative although I think the Idiot's book might be better "if" you are looking at this type of format to get some general knowledge.
If you're looking for an overall description, this is OK - if you're not a Wiccan or Witch. If you are, and have read some other books (Scott Cunningham for example), then you won't gain much from this.