A few years ago I was at a failing company. The quick influx of detailed negative reviews (from people who were both still there and who had recently left) was

A few years ago I was at a failing company. The quick influx of detailed negative reviews (from people who were both still there and who had recently left) was perhaps the only public indicator that things were going poorly. I felt so terrible for all the people who were joining based on rosy promises while glassdoor reviews laid it all out. So yeah, in many cases glassdoor is a strong signal. Don't just look at the average rating, read the reviews from the past few months and look for trends and red flags.