Since the first season of Marco Polo dropped on Netflix a week ago, the 13th-century medieval epic has suffered a critical pile-on that feels almost gleeful in its disdain. It’s “the most gorgeous thing you’ll ever fall asleep to,” “meh,” “ludicrous,” and “binge-proof,” which may be the worst insult of all to level at a show created by the streaming service that popularized the habit of binge-watching.