Isn't it possible to rig Glassdoor by using multiple accounts? It may be harder to achieve in huge corporations, but for small companies, it's way too easy to make the bad reviews seem meaningless.

In any case, it's easy to spot when a review isn't honest, good or bad. They often seem scripted, pointing out some bad aspects that aren't really bad, and highlighting the same upsides over and over again.

It's just a question of filtering those and getting to what really matters. As for the companies that are forcing employers to write good reviews... how can they be sure of which review was done by who? Can't they just give a bad review instead when asked? I can see that backfiring really quick.