How can we combat fake or bad reviews online? When a business owner pays for dozens of fake reviews to puff up their business, that's bad, but it's also bad when someone posts a fake negative review, or when someone merely threatens to do so in order to get better treatment. That last behaviour has seen many hotels demand that no "unauthorised" reviews be posted at all, just to protect themselves from those crazy people.
We could try to take the "pics or it didn't happen" route, dismissing any reviews that don't include photographic evidence. In some cases, that would be enough, but it wouldn't necessarily stop aforementioned crazies from ruining a hotel room before taking pictures as proof.
Mokalus of Borg
PS - In short, requiring photos and video may help, but won't be the silver bullet.
PPS - There is never a silver bullet.