Worth watching, yes. Disappointing, yes.
This movie is SO INTERESTING and has wonderful ideas and potential for something greater but they didn't explore what they should have. Zurg was highly disappointing, as he is supposed to be Emperor Zurg: Sworn enemy of the Galactic Alliance and in this movie, he is not. As well, they present this as "the movie Andy saw as a child" and it most certainly is not since it doesn't keep any consistency with the Toy Story films other than fun quotes.