I have always liked folklore, myth and fantasy but was not so keen on "fairy tales," as most have been sanitised for a twentieth century audience. Not so with Grimms' collection. These stories stick closely to the original folklore on which they are based. There are plenty of well-known "classics" such as Snow White, Sleeping Beauty, and Hansel and Gretel, but dozens of others which I did not know before. Both kinds are exceedingly dark which, I suspect, most children would prefer to the modern versions. I certainly did.
One criticism is that there is a lot of repetition. Several of the stories are about beautiful, well-mannered and hardworking daughters of widowers who are faced with evil stepmothers (often witches) who want them dead to make way for their own ugly, rude and lazy offspring. These inevitably end with justice being done at the end of the tale after hardship throughout.
There were also a few with three brothers seeking their fortune. The tales usually have the two eldest as wastrels but the youngest, who nobody expected anything of, is the only one to do well for himself.
I think these show the way of the world when the stories were written. Women often died in childbirth so stepmothers were common and I'm sure many a child was treated unfairly by them and longed for justice. And, in a world where eldest sons inherited all while younger ones might become destitute, stories of them turning their misfortune into success would go down well.
Others in the collection are bleaker, with robbers and ne'er-do-wells getting away with their crimes. I must admit that I preferred these, if only because it made a refreshing change from the usual happy ending.
There are also some comic tales which I really enjoyed. Hans in Luck, and Prudent Hans for example. Both about an idiotic boy who, by his own stupidity, loses all he has.
The low points were the few stories which seemed to me to be nonsense. For example, The Death of the Hen which I found dull and, if it was making a point, it was lost on me.
Overall an enjoyable read. If you like fairy tales, and are not put off by a darker edge, then these are for you.