I was thinking about this today (read it this morning). I'm very happy to have reviews of schools on here. People are idiots if they take opinions from strangers as the absolute truth but it's possible to get a feel for the school from the positive and negative things people write.
It's a much better place for reviews of schools than school review sites because of the discussion here, the ability to gently prod and find out about the person telling you about it. Eg, I know a woman whose recommendation of just about anything means that I won't like it.
Schools can change quickly and inspections are as only as good as the inspectors. It's like finding out more about a holiday - disregard the bumpf and guidebooks and ask people who have been there!