"Okay"
It started off pretty fun, with lots of laugh out loud moments, but then tailed off and became less interesting. It wasn't bad, just not great, and certainly not as insightful as Gaiman led us to believe.
"Disappointing"
Basically Harry Potter for grown ups, but completely lacking in spirit or engaging characters. There's really only one character in the book, the protagonist, and he's a self-interested bore. I liked the premise of the book but hated the execution.
"fun, but not great"
A found his earlier book, American Gods, more original and compelling. This book didn't have much of a plot but was okay overall.
"Predictable"
Predictable (I haven't read the main series) and overly dramatic. Never a sense of humor, and all the characters are pretty much the same.
The story might be compelling for a teen, but an adult is advised to look elsewhere.