I wasn't a fan of this book. Overall, the writing was mediocre at best. The dialogue frequently feels unrealistic. Thor seemed more focused on inserting as many product placements into the book as possible than writing a well-written book. He took every chance he could to describe a noun by dropping a brand name (e.g., characters never grab a water bottle, they grab an Evian).
None of the characters were particularly compelling. Scot Harvath is a stereotypical reluctant hero who chafes at authority, hates bureaucracy, is patriotic and honorable and always does the right thing. None of the supporting characters are memorable, and the book fails the Bechdel test.
Thor is obviously targeting a conservative audience and his characters frequently rant about how fundamentalist Islam and PC culture are destroying America.