I had high expectations for this book and in my opinion it did not disappoint. If you're going into the book expecting the same level of depth and character development that you would find in American Gods or even Graveyard Book, you will probably leave wanting more, but as a novella I think it performed marvelously. I think that Ocean at the End of the Lane perfectly encapsulated the overall feeling of what a myth is comprised of in terms of language. As opposed to American Gods or Anasi Boys (or even Good Omens) which focus around already established myths and shines new light on them, Ocean at the End of the Lane is its own creation. Obviously there are fantastical elements taken from previously established rules (the mother, maiden, crone grouping being the first immediate example) but it's used to amplify the mythos Neil Gaiman is creating, as opposed to being the sole foundation the book is based on. 
 Ocean at the End of the Lane hasn't yet knocked Graveyard Book off my spot as "favorite Gaiman work" but it definitely will find its place away from my bookshelf as I continually reread it.