It's kinda goofy how people rate one star because of one thing they don't like. Objectively the movie is good, the animation is clean and if someone says otherwise they don't know what animation is. The story was nice and each character felt like they had an important role to play which they certainly did, and unlike many other movies out there it wasn't filled with boring filler and ontop of that it wasn't one of the movies that felt like it took years to finish. Some people might not enjoy anime in general or the idea of demon slayer which that's perfectly fine but that doesn't mean you should bash the movie for it.