We saw it yesterday. Pretty decent! It had the big hollywood makeover and was better than the critics say, but don't see it if you don't like musicals.
If I were to critique, the sound was a bit off. Fantastic music backing with some pretty sloppy vocals (except Swift, Hudson, Dench, who were obviously put there to show how it's done). The vocals were recorded live on set, and sound a bit "mono". I guess they were trying to keep the live musical feel and happy to sacrifice some quality for it. Hudson's song Memories brings it all to a dizzy climax. Dench's lip perfect timing and punchy pronunciation is genius.
But, with Corden and Wilson adding humour, the vivid colours, the set pieces, the beautiful allure of the ballerina lead, the ethereal plot (daft but literally magical nonetheless)... Defo worth it.