Tim McGraw may not be the hardest-working man in country music, but he sounds the part, having risen to megastardom by projecting the charm of a bootstrapper. His 10th album is best when it's a little grim, as on the spaghetti-Westernized "If I Died Today," in which a waiter contemplates the abyss, and "Mr. Whoever You Are," a bleak ballad about a dead-end romance. McGraw doesn't have the vocal...