Another superhero-vs.-superhero dukeout movie, arriving a little less than two months after Batman vs. Superman: Dawn of Justice (Warner Bros., 3.16)? If anyone can pull this kind of thing off it’s the Russo brothers, who seem to be the best thing to happen to superhero movies in a dog’s age and are, in my eyes, antidotes to the Zack Snyder virus. But I’m dreading the prospect of watching Robert Downey, Jr. doing his Tony Stark/Iron Man sardonic multi-billionaire quipster bullshit for what feels like the ninth or tenth time. Please kill this guy off. Enough.