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Because Homecoming had a pretty good idea of what it wanted to be: a highschool dramady with a villain who is at once relatable, menacing, and a direct consequence of the events of the established universe. To answer your question, it'd be better to compare/contrast BvS to Civil War. Why is it superhero infighting works in the latter and not in the former?
When you think about it the stories have really similar beats. Important third act plot elements relating to parents? Check. Supervillain manipulating things behind the scenes? Check. Introducing new characters in order to flesh out and expand the universe? Check. And yet Civil War succeeds where BvS fails. Why?
I think there are several reasons why it was as panned as it was, and the biggest of these reasons has to do with a bad third act. The dialogue, which up until that point had been pretty tight, became trash. A final boss battle ensued in a movie that for all intents and purposes should have been about the tumultuous beginnings of a relationship between two men of conflicting ideologies trying to solve the same problem. Poorly shot and kitschy slomo fight scenes (only in Wonder Woman has there been an instance where this looks good, in the No Man's Land sequence, where it looked like a well composed comic panel action scene). And then of course the entire bit with the kryptonite spear, which just confused the shit out of everybody at a point where things should have been kept as streamlined as possible.
