[exodust]

Not only that, but overly positive, glass always half full comments for the sake of guidelines might prevent the next AirBnB too.

Perhaps for those people seeking feedback who want brutally raw, might-hurt-a-bit honesty, a special flag can be set inviting all manner of such comments. I know I'd elect for that, and would be disappointed with anything less. Spicy internet discussion can flush out the pipes of a concept and invigorate thoughtful discussion quite efficiently. It can also derail, but it's worth the risk IMHO.