I've never understood the complaining about having to watch previous Marvel movies to understand the new one. I don't see why you'd go to Civil War without seeing TWS and AOU (it's two biggest tie ins first). Even if each movie isn't a sequel they're made to build and cumulate off each other. I'm sure as DC builds the same will happen. They expect their audience to follow along not just start at the newest movie. What's the point of connecting all the movies in the same universe if a number of them are standalone.