Perhaps my absolute favourite couple of animated films were made by someone other than Studio Ghibli, but for sheer consistency of quality, Ghibli is amazing. A measure of this quality is that in 11 Ghibli reviews I've written (if you count 'Castle of Cagliostro'), every single film has rated at least three stars, and even this tossed-off piece of fluff is probably better than most of what Disney made in the 60's or 70's. Disney has never had a run of 20 years without a bad movie. Nobody else has. Other studios must feel like some 60's rock band watching The Beatles churn out masterpieces one after another. If that analogy holds, then maybe those other studios don't feel quite so threatened by 'The Cat Returns'. It's like Ghibli's 'Magical Mystery Tour'. With that much talent behind it, you know it can't be bad, but it's not going to redefine animation either.
'The Cat Returns' is a spin-off of from 'Whisper of the Heart', and it's a shame that they are being released in the reverse order in the west, but you shouldn't make too much of the connection. Really all that the two movies have in common are the cat characters The Baron and Muta, and their roles really have little to do with WotH. In that earlier movie Muta was just an ordinary cat who didn't even speak, and The Baron was a statue who only 'came to life' in a brief dream-like sequence. The whole 'Kingdom of he cats' thing has nothing to do with 'Whisper of the Heart' either. So whereas it would be preferable to watch them in the correct order, it's not because you're missing any background, but just because if you watch this one first I imagine it would rather spoil your enjoyment of 'Whisper' because you'd be expecting context which doesn't exist.
Haru is a girl who saves a cat from being run over. He turns out to be the Prince of cats, and the cat Kingdom decides to show their gratitude by taking Haru there and arranging for her to marry the Prince. Haru isn't totally in love with this idea and turns to The Baron and Muta for help.
The Baron is a fairly two-dimensional character, but Muta is great. In fact I think I can say now that anyone who likes cats is just going to love this film and forgive any minor inadequecies.
What inadequecies? Well, nothing much to speak of, except that the film is rather short, lacks the depth of other Ghibli movies, and the latter half feels rushed.
This is also the only Ghibli film I've seen (except maybe 'Totoro') in which there is no attempt to explain any of the magical elements in any logical way. 'Whisper of the Heart' has just the merest hint of the fantastic about it, because you sense that coincidences keep happening beyond what is reasonable, and you have an odd feeling about a couple of the characters. Even in 'Spirited Away' there is a definite attempt to explain how the main character crosses over from the regular world to the spirit world. And 'Princess Mononoke'and 'Kiki' are set in worlds where magic is part of the way things work. 'The Cat Returns' is set in the normal world, but totally impossible, ridiculous things just start happening from the get-go, with no attempt to explain why, except maybe, maybe, maybe it was a dream (but probably not). It's quite charming really.
As with any Ghibli film, the thing is a feast for the eyes from start to finish, with classic moments just sprinkled around carelessly as if the studio has so much talent that it has boxes full of the things and doesn't know what to do with them all. The film has a definite 'Alice in Wonderland' feel (I mean the book, not the wretched Disney version of it), right down to the adventure being precipitated by size-changing.
It's a carefree, feel-good film which shows Ghibli taking their foot off the gas a little, but still producing something most studios would be jealous of.
But if by some chance you are less than impressed with this film, please don't miss 'Whisper of the Heart'. The films have very little in common. 'Whisper' is a much slower, 'serious' (though still 'feel good') movie, and whereas there isn't a great deal of depth or texture in 'Cat Returns', 'Whisper' just exudes such qualities.
This is a good, fun film. Almost a three and a half'er - but 'Whisper of the Heart' is an incredible work which is as good as anything Ghibli have ever made. See them both, but see 'Whisper', whatever you think of this one.