Avengers: Infinity War

Infinity War wins the award for shock factor as far as superhero films go. The ending where Thanos wipes out half of the universe without a second thought and then the screen cuts out left viewers gasping. It perfectly executes a huge ensemble cast, intricate overlapping plotlines, and enough action to keep things moving without seeming too ambitious. 

Iron Man

Tony Stark is head of the Avengers, and his backstory told in the 2008 Iron Man film is the perfect set up. Robert Downey Jr. plays the tech mogul-turned superhero decked out in the metal suit and he does so perfectly. Gwyneth Paltrow co-stars as Pepper Potts, his assistant and love interest.