The first 5 minutes of the movie shows probably the most tender love story I have very seen in a movie... EVER!
And I will stop with the movie details there.
The reason I go to the movies is to be entertained, if I leave feeling good it was worth the money, it was a very good movie if we talk about our favorites parts and reenact the scenes for a day or two after. With those as the standards Up was a very good movie.
You can read the New York Time review of the movie, or just grab your family, get in your car now and go see it (I vote for getting in the car).