I give this movie ten zs. I couldn't get through it before falling asleep.
The other comments mentioned the groaner lines (i.e. "Farewell, Tarter Woman") but what they didn't mention is that the whole script is a groaner. Seems that Susan Hayward's wardrobe was recycled from a biblical flick. All the roles are over the top, from Wayne looking like a cross between a carpetbagger and the cat Gideon from Pinocchio, to Hayward doing a true biblical vamp. Wayne, not a versatile actor, sounds whiny in this role. Even the action shots of the battles and horses were boring. If a movie is based on a place in a certain time, it should have some relation to that place and period, or at least depart in a witty or funny way. This depiction of Mongolia around 1200 did neither. This movie deserves the "slow death".
If you want to see a good Genghis Khan movie that was actually shot in Mongolia and has some realism, see the recent Genghis Khan, by Aoki Okami. If you want to see other movies shot in Mongolia, see Genghis Blues or the movies of Byambasurem Davaa: The Weeping Camel and The Cave of the Yellow Dog.
If you want to see some good battle scenes with horses, see Seven Samurai.
This movie maybe good for a laugh, but I couldn't stay awake long enough.