Found this today and there's lots of convincing stats here, and in fact reasons for everyone to take a long hard look at their candidate journeys.

I won't ruin the article by sharing too many stats, but here's a summary of one.

Candidates value the careers site less now than they did 3-4 years ago. And reviews are on the up. It makes complete sense though right? If a friend had a poor experience when applying for a job, they'll tell their friends. And now, you can tell the world.

Encouragingly when i asked a few focus groups people seem to use Glassdoor much as you would TripAdvisor, so the odd negative shouldn't impact you too much. But the more you have the worse it'll get.