It appears a flat % score is the main draw, but without any sort of information on what that score means, or how it stacks up, it's sort of useless.
I built EdScore out of frustration that this data is all public but buried in disparate state/federal databases and not accessible to parents, even though we're paying for it to be compiled/collected.
I think ratings (controversial as they are no matter what methodology you use) help parents do a quick sort of local options. And our goal with EdScore is to add search filters like commute distance, home price, school size, special ed offerings etc so that parents can search for the "right" school for their individual child based on various inputs, not a simple "best" rating or 1-10 scale that, absent other factors, is not very informative.