1.) World War 2 really happened. A lot of people died. In CA 2, Cap was not the cause of exponentially more innocent deaths than actually occurred in WW 2 (like we saw with multiple sky scrapers being demolished in MOS).
2). You might be right about a lot of innocent deaths in Avengers. They made it clear that a lot of innocents died in Avengers 2. But, it was very clear that protecting innocent people was the most important thing to the heroes. They were going out of their way to find a way to save as many of them as possible. Superman didn't care. Not only did he not go out of his way to save innocent victims, he didn't even show any evidence that they crossed his mind. The innocent deaths in Avengers and Avengers 2 was a big part of the story line in Civil War, and a big part of the reason the government wanted all super powered beings to be registered, monitored and controlled.
3). Days OFP showed us glimpses of a post-apocaleptic world, but the innocent deaths involved mutants, not normal humans. The world was dark and dreary, and the heroes found a way to prevent that world from becoming reality.
4). GOTG didn't take place on earth and had only 1 character who came from the planet earth.
Almost all of the super hero movies depict situations where innocents are endangered in large numbers. Super powered beings are the ones endangering them. Other super powered beings step in to protect the victims and defeat the evil beings. They make sacrifices to protect the innocent victims and clearly save as many of them as they possibly can. That was not the case in MOS. Superman showed no concern about innocent residents of the city and was directly responsible for annihilation of multiple structures that seemed likely to be full of people. It ruined the movie for me, as it just didn't fit with my impression of what Superman is (and should be) all about.
