For those of you already knocking the graphics, keep this in mind.
With CGI, the animation can be completed before final rendering of the film is done. Since these characters are essentially just models in a computer, slight changes in them can be made up until the last minute, and those changes go on to affect the look throughout the entire film. It's much more difficult with CGI to tell what is done and what is not, it's not like seeing the old pencil tests from traditionally animated pictures. The CGI in the Chicken Little trailer seemed like it was in the vein of "Jimmy Neutron" type quality, which is acceptable, but not Pixar.
I'm sure Sully looked pretty flat before the put in the little program that made his fur move, and I'm sure chicken little will look better by the time the movie is completed.