Spin isn’t necessarily bad, but it isn’t necessarily good, either. It's somewhere inbetween, which isn't good enough for me to want to continue with the series.
Shadow's Son is akin to a blockbuster summer movie that almost works. It's good entertainment, but won't leave you hungry for more.
Sometimes a book doesn't live up to the hype. Peter Brett's The Warded Man was one of those for me as a great premise fizzles out and is ultimately wasted.