Way I see it - I want to know the non-payers and those who mess around (I just got screwed over by a new family earlier this week and now am without income). It is not slander/libel/defamation when it's factual. If you stray from the facts and make it personal or put emotion in it, it can be a legal issue for sure. I think that most people would be able to read through the lines and see whether it's a personality conflict or a true issue, you know? But overall, there are reviews on everything out there in the world and opinions, so why not on parents?