This is the only feature-length movie written by Dr. Seuss, and that should be a good enough reason for you to see it.
sovay wrote a detailed review, which roughly does it justice. In addition to all its other virtues (Siamese twins connected by their beard on roller skates! a ladder that just goes way up to nowhere! the dictator's wardrobe scene with dancing valets!), it has the best evil minion song I've ever heard. And I mean barbershop singing about having poison ivy, unlike the more respectable schools.
She mentions that there were commercials, but when I saw it, it didn't. Maybe crackle.com is using intermittent reinforcement.