This graphic novel has several good points. It enriches the pre-Movie background introduced in Froud's World of the Dark Crystal without getting too bogged down in trivial details. Being a book of "mythology", you don't have to get too hung up on the specifics of certain tales, such as how the gelfling maid got her wings, and enjoy them for what they are, stories. While in a distinct style, the artwork fits well with the ambiance that Henson and Froud had already established for Thra. My personal favorite aspect of the book is the further development of the Urskeks. Building on the ideas introduced in the WotDC, you get more of their story built in a way that makes them more approachable as characters.
The only reservation I have is the introduction of Augra's son, Raunip. While a necessary element to telling the story, particularly because of how they developed Augra's character, Raunip's presence is strange. As the asserted "trickster" character, he is useful in demonstrating Augra's blind-spots in her role as Observer & Guardian of Thra, and helping flesh out the 'darkness' of the UrSkeks, but his origin seems pointless, and I can't help but think that before the series is done, he will be quite dead. Perhaps a gelfling could have served the same purpose?
Overall, I am very glad to have added it to my Dark Crystal collection.