Because besides the actions scenes, none of the movie was good. The characters fighting felt weird and unnatural. It was cool, but their reasons for it felt thin. A lot of the dialog was either boring or dumb. They bring back Ross but don't do anything with him (easily could've introduced Red Hulk). Tony's anger was on the silly levels of Martha (and I saw the movies damn near back to back, there are way too many similarities besides picking two sides of a fight). "I've excepted the fact that you are not in control at all when hydra says your code word but I am just so angry that you killed my parents even though I've never brought this up before this movie and it feels weird and out of place." The villain was just all around dumb. Really, it's fucking Zemo and this is what we get? A guy with a plan that shouldn't work for so many reasons and could've had his own super soldiers but didn't want those, just wanted to split the Avengers which didn't really 100% work. Most people you ask about it will always bring up the fight again Cross-bones, the highway chase or the airport fight because those were so well done, while the rest of the movie is just dumb and/or forgettable.