Walt Disney and Marvel’s Guardians of the Galaxy debuted with a powerhouse $94 million opening weekend. That’s the third biggest opening of the year, behind Captain America: The Winter Soldier ($95m) and Transformers: Age of Extinction ($100m). Since opening weekend is of course about marketing, Walt Disney deserves a gold star in that department. From the get-go, their marketing campaign as been a textbook example of how to sell an unknown property to the masses. Of course, it helps that James Gunn and company delivered a winning final product, and so Disney screened it early and often and let the review embargo drop right before Comic-Con. And...