The Longmire books are highly addictive. I always clear the decks when one of those books comes out, so I can start it right away. There are other series that I'm hopelessly behind on, like Reacher, Joe Pickett and Mary Russell. If you ever get the chance to meet Craig Johnson, he's a real hoot.
Lee Child's take on Cruise as Reacher is really that there are no A-list actors who could really have taken on the role and done as well and who are tall enough to meet the description of him in the books. Both movies are good, although I really think I enjoyed the first one more. (Child does little non-speaking cameos in both movies, by the way; he's a police desk sergeant in the first one, a TSA agent in the second.)