It's been a banner year for Marvel so far, with Guardians of the Galaxy likely set to pass Captain America: The Winter Soldier sometime this week as the top-grossing movie of 2014. Many fans believe this Marvel Phase Two adventure, which expands the Marvel Cinematic Universe into the cosmos, is the studio's best offering yet.Add Tony Stark himself, Robert Downey Jr., to the list of fans, with the actor revealing at the Toronto International Film Festival, that he believes Guardians of the Galaxy is Marvel's best movie yet."Galaxy in some ways is the best Marvel movie ever.