I saw it in 3D in the cinema and whilst it was a lovely film, I didn't understand the point of making it in 3D. It added nothing whatsoever to the experience- the story, the performances and the heart it had were the important things
To line Disney's pockets due to the higher ticket price? Having said that though, the kind of 3D used in 'Up' was my preferred kind where it wasn't used purely as a gimmick to have things being thrown at the viewer, but instead it just adds a subtle depth of field effect. 'Avatar' was the same (better infact), and it definitely seems to draw you in more.