The cast, orchestra, costumes and sets were wonderful - Liu could break your heart. I sure hope she'll be back in future productions. The 4 out of 5 is due to technical problems causing numerous audio and video interruptions.
The transmission of course was perfect; the setting and over - active camera work obscured the plot and acting. The tenor seemed totally uninvolved - maybe the set got in his way, as Susan Graham commented during her interview.
It's time for a return to traditional settings - cut out the cubicles, wall-crawlers, etc.