I like Pixar a lot. But maybe it’s just a matter of personal taste.
Letting go is a unifying theme in Up but my problem with the movie isn’t that it’s bad but that you had a table of all the guys at Pixar spitballing scene ideas and then glueing them all together. The result just feels episodic, in a bad way, and commercially manufactured. Up is a really good movie but I don’t want every CG film to have the Pixar preproduction process. (And I still think they are a bit overrated and that the technical side of their creative teams are doing most of the heavy lifting.)