They substantially changed the discourse. Few were calling Wall Street on their role in the financial crash and their heads-I-win-tails-you-lose games with taxpayer money.
It also gave a lot of people a taste for direct action. There was a great interview on NPR recently with an author of a book on the Occupy movement. He had a number of examples of organizations that had grown out of the Occupy movement in the same way that Occupy Sandy and the debt jubilee folks did.