This was a neat little audiobook. I know Jason Segel as an actor, but he's a pretty good writer as well. It was a nice bonus that he narrated the story. I only gave it three stars because it wasn't ground-breaking for me. I thought it was a cute idea, and I liked the message about conquering your deepest fears, and dealing with grief. I felt bad for Charlie's step-mother, whom he treated really awfully, because of the fact that she wasn't his mother and his dad and brother seemed to be moving on and he wasn't. I actually thought stepmom Charlotte was pretty interesting. I would have liked more interactions between her and Charlie, especially more positive when he dealt with his issues towards her. Ultimately, this never got to the point that I didn't want to turn it off when I had something else to do.
The nightmare world was a bit creepy. The descriptions and the characterizations of the the nightmare realm were on point. I think for a young reader, it might be genuinely scary. Some of the nightmare characters were actually the real draw of this book, like Meduso and his mother (you know who). And who would have thought a clown would be a good guy (yes I do have a bit of coulrophobia).
I think this is one you definitely want to get the audiobook for. I think it's the best way to experience this book.