Maybe it depends on industry, but I looked on Glassdoor for a company I applied for a job with. They had mostly ok reviews that were lacking details and quite vague and then they also had a few reviews that were very detailed outlining how terrible the company was. I should have taken note of those negative reviews. My experience was also awful and the company was super dodgy. I never bothered to write a review about it though. How good or bad does an experience need to be to motivate someone to write a review.