You simply can't take "The Adventures of Marco Polo" seriously...but as a light-hearted, glossy, tongue-in-cheek adventure, the film is great fun, from the same year as Warner's "The Adventures of Robin Hood".
With producer Samuel Goldwyn's biggest box office star, Gary Cooper, in the lead, as a drawling, skirt-chasing Polo, the film opens with an opulent, Hollywood version of 13th century Venice, then quickly moves to the steppes of central Asia, and finally the equally opulent court of Chinese Emperor Kublai Khan (George Barbier), where Cooper and his groaning comic relief (Ernest Truex) encounter Khan's exotic, if not particularly Oriental-looking, daughter (Sigrid Gurie...who learns how to kiss from the obliging Polo), and Khan's ruthless adviser, Ahmed (another terrific villainous portrayal by Basil Rathbone), who has designs on both China and Gurie.
Screenwriter Robert Sherwood tosses in a bit of history (the Chinese inventions of spaghetti and gunpowder, introduced to Polo by H.B. Warner, channeling his "Lost Horizon" persona), but clearly treats the storyline as farce, adding a feared (but henpecked) tribal chief (a heavily made-up Alan Hale), and his jealous wife (Binnie Barnes, who also falls under Polo's spell). Also, watch for 17-year-old Lana Turner in a small but showy role as a most desirable Chinese handmaiden (this is the infamous film where Goldwyn's makeup department burned off her eyebrows, permanently).
Directed by veteran director Archie Mayo (who lacked Michael Curtiz' flair for epic period adventure), the action scenes are a bit flat, and Cooper's climactic fight with Rathbone is somewhat disappointing (truthfully, he seems out-of-place confronting a swashbuckling villain). Certainly, 1938 audiences weren't 'buying' Cooper as an Italian adventurer (it WAS a stretch!), and the film flopped, but if you're in the mood for pure escapism, from Hollywood's 'Golden' age, "The Adventures of Marco Polo" is certainly worth a look!