In the introduction, Joyce Crick says the purpose of this edition of Selected Tales by Jacob and Wilhelm Grimm is to "give the book back to the authors" by which she means Jacob and Wilhelm Grimm. The Grimm's collected these tales at a place and time that basically made them the first people in the "modern" era to do such a thing. Of course, their product, their "Tales" had an after life that spawned hundreds of years of children's literature in Germany and the US, and eventually became the substantial basis for all of the early Disney smash hits, more or less. Say what you want about Walt Disney being a Nazi, but no one who has been to Salzburg can deny the similarity.
The Grimms, being who they were,writing when they were, didn't provide any context, just the tales. However, over time they did edit the selection of Tales, taking out some of the more gruesome tales and editing some of the remaining tales. This edition does a good job of running through those differences.
Although I had a clear idea that the original Grimm's tales were much darker then the American/Disney versions, until I read this recentely published book (2009 in America, 2008 UK?) I had never actually READ any of the tales. I would have liked more info about the pre-Christian elements, but that was beyond the scope of the edition. Maybe next time...