[giobox]

This is purely speculation, but I've often wondered if some of the inexplicable positive reviews at bad places I've worked are the product of the company HR team - I wouldn't be surprised at all if some companies try to game their glass door rating if it gets too bad. I've certainly worked some places where there were a bunch of positive reviews that looked suspiciously like the work of a single person.

[sevensor]

This is absolutely, with no exaggeration or guesswork required, true. I had friends in HR at a former employer who were asked to do this. It was hardly a secret within the company.

[trophycase]

Yes this is true for nearly any meaningful online ratings: Amazon, Imdb, Yelp. Negative reviews are the more reliable indicator.