The sense of place and uniformly superb performances make it worth seeing, and maybe ultimately singing along with.
OK, now they've done it. They've shown that they really can take performances from old movies and re-animate them to make new scenes the original actors never did. And make it look pretty convincing. Take a gander at this astonishing UK ad for the VW Golf GTI ("The original, updated."), in which Gene Kelly does a whole new kind of singin' and dancin' in the rain. Sacrilege or marvel? Whatever you make of it, at least it's a hell of a lot better made than the infamous 1997 Dirt Devil spot with Fred Astaire and the vacuum cleaner, based on the famous "dancing on the ceiling" bit from "Royal Wedding"...