FWIW, we love Andrew Lang's Fairy Books and own all of them. His language is wonderful! Remember, these are collected stories, not out of Andrew Lang's mind, but from the world of folk tales and fairy tales. (Folk tales and fairy tales were NOT originally just for wee ones-- quite the contrary. Imagine a storyteller weaving webs of imagination while he warms his toes by the fire, while listeners gather near with ever-widening eyes. It's our oral tradition; and the race was on among Lang, the Brothers Grimm, Asbjornsen, Moe, and others to collect them.)
My best advice is to pre-read any story you're unsure about, or stick to the stories that you personally know well. What one family may enjoy, another would shrink from in horror.
My ds, for example, can't stand any cruelty, but LOVES the stories (there are several) of proud young women "speaking frogs" after being bewitched on account of their pride. (The lovely, generous, humble maidens usually pour forth pearls, rubies, or gold coins from their mouths.) It's a pretty potent image!