Earlier quoted context omitted.
Yeah that's true. We really need some service like blind where people can anonymously review and score managers. We need votes to prove that a manager is an ass hole. One anecdotal story isn't enough. Maybe the service leaves the manager anonymous until the review amount crosses a certain threshold... 3 to 4 guys calling him out? Submit this to ycombinator!
Honest question: how to prevent abusing this system?
That means one person can't run a smear campaign. At least 2 or 3 other people have to agree with you, and if they do then it's legit. The system masks the persons negative reviews until that manager has accumulated greater than 3 or 4.
Three or four negative reviews from people in the company is NOT a minor issue.