Let's be clear, Up is another elegant, uplifting animated movie. A movie only Pixar could tell, with classic characters, sumptuous visuals and talking dogs flying biplanes. (Really!)
It's also Pixar's first film in 3-D. Which brings me to my point. If you love animation, the way I love animation I'm recommending you do not go see the film in 3-D.
Why? Because what you gain isn't worth what you lose.
3-D is better than it used to be. No more red and blue glasses. Now we use funky polarized sunglasses. And yes, Pixar takes a restrained approach to the 3-D effects. There's no Dr.Tongue moment, no stuff flying out of the screen.
In fact the effects are SO subtle, i don't feel they're worth the bother. Pixar make beautiful images. I could write an essay on the way they portray a flashlight glowing under a blanket. So I don't want anything to come between me and that picture. 3-D has come a long way, but the result is a slightly darker, fuzzier image. If you like your picture pristine...follow the advice of Roger Ebert and Village Voice critic Robert Wilonsky. Leave the funny glasses to the horror films.