The Silver Linings Playbook

Why did NPR's popular librarian Nancy Pearl pick "The Silver Linings Playbook" as one of summer's best reads for 2009?
"Aawww shucks!" Pearl said. "I know that's hardly a usual way to begin a book review, but it was my immediate response to finishing Matthew Quick's heartwarming, humorous and soul-satisfying first novel . . . This book makes me smile."
Meet Pat Peoples. Pat has a theory: his life is a movie produced by God. And his God-given mission is to become physically fit and emotionally literate, whereupon God will ensure him a happy ending--the return of his estranged wife, Nikki. (It might not come as a surprise to learn that Pat has spent several years in a mental health facility.)
The problem is, Pat's now home, and everything feels off. No one will talk to him about Nikki; his beloved Philadelphia Eagles keep losing; he's being pursued by the deeply odd Tiffany; his new therapist seems to recommend adultery as a form of therapy. Plus, he's being haunted by Kenny G!
As the award-winning novelist Justin Cronin put it: "Tender, soulful, hilarious, and true, "The Silver Linings Playbook" is a wonderful debut."