And yet, as films, I think the Harry potter films are in many way better than the film versions of LotR. Although I do struggle with the manifest lack of world building. Inasmuch as the wizarding world is superficially part of the real world now. Which just doesn't really work. There are all these wizards around doing quite visible stuff and the military never takes an interest? MI5 doesn't notice all the people flushing themselves down toilets in central London and take a vague interest? No wizard ever thinks well, these death eaters have powerful magical abilities, but there anathema to muggle tech means they won't see my M134 Minigun coming?
These are nerdish hangups for nerds, but I think if you do the 'my setting is a hidden part of the real world' you have to address what happens when the real world and the fictional world come into some sort of conflict. Even if it is just to point out that your monsters are immune to bullets.