I think online directories are exceedingly valuable for helping students and teachers find each other.
But as for the rating system? Dance happens in real space...not cyberspace. There is no substitute for actually getting to know people in the community, getting to know their likes and dislikes enough to evaluate the information they give you, and trying out a few classes yourself with the local teachers.
I see so many brand-new students (and would-be) students agitated about finding the "best" teacher, when they should just jump in and see what works for them.
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