One of the problems I've always had with non-Pixar CGI animated features is that, in general, the story sometimes takes second place to all of the pop culture references inserted into them . While I realize it's a ploy to attract adult viewers to the movie, it's often distracting, and, more often than not, it dates the movie, as a number of the references will no longer be recognizable three to five years years from now. With Pixar, the emphasis is clearly telling a good story, and it shows.
Dreamworks' "Kung Fu Panda" is probably the first effort by the studio to focus on the story; there is little or no hint of pop culture reference to be found in the movie. It's a refreshing change from such movies as "Shark Tale" or "Madagascar".
Once more, no spoilers, but what I can say is that the movie is one of the better CGI films to come out, and may give Pixar a run for its money come Oscar time. Do try to watch it.