Reliable, no. Useful, yes, but mainly in the aggregate. If there are only a few reviews for a company and those reviews are all over the map, I'm not going to

Reliable, no. Useful, yes, but mainly in the aggregate. If there are only a few reviews for a company and those reviews are all over the map, I'm not going to put a lot of stock in any of them. However, if there are a dozen or more reviews, most of which come across as fair and nuanced regardless of the score they assign, then I feel comfortable drawing some hypotheses based on the points they raise. Also, companies can respond to reviews on Glassdoor. In more than one case the content of the (defensive) response has been more valuable to me than the original review.