From Tom Shales' review of the "Planet Earth" series on the Discovery Channel:
Beyond its technical and aesthetic achievement, the film is so rich in spectacle that you won't want to take your eyes off the screen (except during commercial breaks, and it appears there'll be lots of those). One is bound to gain a new appreciation and feel a new respect for the planet, which, even in times of heightened environmental awareness, we tend to take for granted.
The whole review here at WaPo.