They should have called this movie: "Adopted Mouse Brother That is Slightly Inspired by Someone's Vague Recollection of Stuart Little Who Just Kind of Skimmed the Book a Little, But Mostly Just Remembered the Cover" If it wasn't so misleading I'd give it a better review.
But seriously people, do your kids a favor and have them read the book. They might actually learn something instead of having their mind numbed by what we all know as Hollywood film.
The book Stuart little isn't about a mouse, it's about a person who happens to be very small and mouse-like. He's born to his parents, not adopted. The book is about his life and his eventual departure from home and the journey he embarks on. There is a cat named Snowball who thinks he's food and wants to eat him, but Snowball can't talk.
In the movie they screw all of that up. I think the only things that they kept from the book were the boat race and the names.