EntertainmentWhen Smash made its glittering premiere last season, complete with its Spielberg-Meron-Zadan imprimatur, many of us fell in love with the NBC serial that took us behind the scenes of a Broadway musical in the making. But as with many love affairs, somehow the little flaws turned into big disappointments, and the disappointments became less and less tolerable. The magic faded with clunky plot points, an unbelievable villain (Ellis, played by Jaime Cepero), and the show’s insistence that Karen (Katherine …