In this witty and candid perspective on American television, the Pulitzer Prize-winning critic Howard Rosenberg traces a disturbing pattern: TV's relentless pursuit of the mundane in its seeming quest to dumb-down America. And, he writes, it may be succeeding. How else to interpret the onslaught of look-alike, deceptively titled reality shows that have transformed much of prime time into a cratered moonscape? The longer mediocrity endures, Mr. Rosenberg...