I have a weird relationship with Neil Gaiman's books. His stories always fascinate me conceptually, but upon reading them, I'm inevitably underwhelmed. That isn't to say his books are bad, just not as great as I hope they will be upon reading a plot summary.
The Graveyard Book suffers this same small letdown. The idea - a young boy, orphaned after the brutal murder of his family, is raised by the ghosts that inhabit a nearby graveyard - is pretty awesome. The execution, while still very entertaining and enjoyable, is just enough less awesome to be disappointing. Maybe I expect too much from Gaiman, but if that's the case it's his own fault for having such awesome ideas.
The best part about The Graveyard Book is how it celebrates life through the constant presence of death. This theme emerges so naturally from the content of the book that it doesn't ever feel cliche or preachy. Gaiman also ties everything together nicely in the end. Unfortunately, there are too many parts that drag along the way to make it excellent from beginning to end.
On the whole this a good book and, if you choose to go with the audio version, I think you will be pleasantly surprised by Gaiman's skill as a narrator. In spite of my own weird disappointment, I don't have a problem recommending this. It's not Gaiman's best (Neverwhere, Stardust), but it's far from his worst (Good Omens).