Oprah Winfrey's 'Greenleaf' deserves high praise, but her network may not receive its full bounty

More than five years after its much-anticipated debut, the Oprah Winfrey Network finally premieres what should have been its flagship show. "Greenleaf" is an operatic behind-the-scenes account of a daughter's return to a power-crazed family after she has broken ties with their Memphis megachurch...