I think people had a lot of expectations of Occupy that weren't really realistic -- I know I saw quite a few people at Occupy Oakland who viewed Occupy as the first step to an anarchist revolution taking down the system, which didn't seem all that likely to me. At the same time, lots of people viewed Occupy as a Democratic movement to push more progressive liberal politicians into Democratic office, like the Tea Party. I think these people have failed to understand how badly the Tea Party has screwed the Republican party -- not just in the long-term wacky marginalization sense, but in the short-term, by costing them the Senate in '10. Forgive me for not wanting one of those!
I think that Occupy changed the narrative in a very important sense, by returning economic populism to the spotlight. The power of the 99% meme is very important because it's a socialist economic message that takes advantage of lingering anger about the crisis to reach the average American (since it's explicitly about the average American), and we haven't had one of those for a while. The villainization of capitalists is just a plus. I think this Presidential race would look pretty different if OO hadn't happened -- the tax and Bain attacks would have still happened, but I'm not sure they would've been as effective outside of Massachusetts. Nor do I think that Obama would've had the guts to run on a platform of tax increases for the rich, or that most Americans would support such a platform. So that's a change we can believe in, assuming it happens.