None of them are "horrible" by any stretch of the imagination, but the "worst" one I would personally say would have to be Cars as many people have said before. It just didn't strike that chord with me like most Pixar movies, but by no means does that mean that it's a "Bad" movie for me, just not really as good. When I saw the preview trailer to Cars 2 I just sortof went "Well, they're totally not trying to cash in on the franchise." I dunno, I'm not all that confident about the next movie Pixar is pushing out, but I pray that I'm wrong.