I think it's hard to balance the ability to create what you want, with the ability to have enough structure so the site isn't just a random collection of stuff. It's also hard to build a gui that allows non-coders to have fine grained control over the display.
Right now, I feel like this leans too far to the unstructured side, where it's hard to figure out what to use it for. I also find the controls to be kind of cryptic and difficult to use.