I use it occasionally. If I see a post that I think is trivial or stupid, and has a lot of stars by it, I'll rate it a 1. If I see a post I think is really interesting, I rate it a 5. I don't think I've ever rated a post a 2, 3, or 4 though. Most posts I don't rate at all and the number of stars by a post is not the criteria I use in determining whether or not to read it.