Hank Steuver writes, "‘The Roosevelts’: Once you finish all 14 hours, you’re sorry to see them go. Let’s start with the end. When it’s over — when you make it through the marathon that is Ken Burns’s beautiful, seven-part documentary “The Roosevelts: An Intimate History,” which begins Sunday night on PBS — you may find yourself with a lingering, nebulous grief. You’re sorry it’s over. You’re sorry they’re over. You’re sorry a certain expression of American ideals is, or often appears to be, completely over."