I don't get why anyone would want to make a feature film out of a Dr. Seuss book, especially a 3D animated film with comic actors. The film bears virtually no resemblance to the book. I like Steve Carrell a lot, and even Jim Carrey, but they both seem out of place in this film. One problem is that their voices are pretty similar to begin with. Seems like Horton needed more of a character voice. But the biggest problem is trying to stretch a very simple plot into a 90 minute movie.
Can't recommend it.