I've looked at a few companies only, and from what I've seen, in my limited experience, is that the only people motivated to leave reviews were those who were fired/layedoff/let go. So we're left with 100% negative reviews. These are not tech companies, so no one working there has any idea that glassdoor even exists. The place I work now has TERRIBLE reviews, and it's pretty obvious who left the reviews, and it's obvious to me why they left those reviews, but it does not reflect the reality of working here at all.
I guess I should go leave a positive review, but the motivation of an angry/hurt person is WAY higher than those of us who are happy.
My company has two departments, a lot of amazon turk like manual labor for things that haven't been automated yet, and a dev team automating the crap out of everything. Dev is pretty good to work, most of the time. Manual labor department is hell on earth. Reading glassdoor, the reviews are 95% negative from the manual labor department, mixed with reviews from people we turned down during interviews (our interview process used to be horrible), and about two bad reviews from previous devs. One who was let go for basically being as asshole (bad hire, not really his fault, life just got hard and he was young), and one that had some legitimate complaints.
My experience was such that I was fired for performance but was genuinely already looking for employment elsewhere due to a culmination of problems in the department. I went to Glassdoor after some time to see the reviews for the company and whether or the experiences of others would comport with mine. I didn't go there to write a review, but Glassdoor will conceal the majority of reviews until you've contributed one. So I wrote a fairly balanced (not just negative) but notably negative and specific review. I was satisfied to see that there were others that felt the same way.
I guess I should go leave a positive review, but the motivation of an angry/hurt person is WAY higher than those of us who are happy.