The Americanism and Englishness of the players in a Parisian setting can be a bit jarring (or very jarring, depending on your mileage over such things), but that flaw does not detract from the overall beauty of the film.
Yes. Beautiful. That's what this (masterpiece?) is.
Scorsese is one of the few "old breed" American filmmakers left in the world, and I would argue that he's the very best in the world. His films typically pull from a certain vein: purely American. His films are about American culture, history, ideals, misgivings, blunders, etc. This is a universal picture that seeks to do one thing: make the kind of cinematic magic act that the great MÃ (C)liÃ¨s would have made himself, had he been given the technology we have now.