Superhero movies are certainly not high cinema, but I challenge the "no risk" assertion. In the first 22 MCU films, the heroes take major losses in 5 films (e.g., a city is destroyed with impact affecting the rest of the series). The heroes suffer more personal losses in many other movies beyond those 5 (e.g., losing a loved one).

So you usually know what you will get, but the villain winning or partially winning is a credible threat.