How do you figure Zillow to be worthless? First off it is free. Second, no one is saying the the zestimates are useful. The useful data is the comps in the area, the tax information years of purchase etc. Additionally as transactional data gets added to zillow it will continue to get more accurate.
Zillow is sort of like Aybo the robotic dog. If you think you are going to use it to replace a real dog you are an idiot. If on the other hand you simply use it as a novelity or entertainment piece then you get what it represents.
