As an adult who openly admits to loving all Disney and the likes - very few of us don't :-)
It is basically about the bonds of friendship and how important and special they are.
Great story, good characters, the girls and I really enjoyed it and they borrowed it for their kids who enjoyed it also.
It is also an enjoyable way of having a look at history too.
Enjoy as this is one of those films that adults and kids will both enjoy equally.
My friends little girl always watches it with her two my little pony toys which are similar colours and everyone just loves Rain :-)