I've been fortunate to not have to use GD for anything other than a quick salary lookup and some reviews about the interview process.
Even then, it's been mostly useless as it forces you to sign in after viewing a couple of pages, and the reviews are written mostly by people who didn't get the job.
As you can imagine, most don't put a lot of thought into writing their reviews, or even recalling what the interview was like.
If knowing about company culture is important to you, you're better off messaging someone on LinkedIn and ask for a quick coffee chat or something.
I can tell you that the salary can be ridiculously wrong. For a high-experience specialist position in a high-cost city, Glassdoor has a salary number that is well below what we would pay for a freshman college intern in our lowest cost-of-living location.
I hope you didn't decline to apply to us based on Glassdoor.
Even then, it's been mostly useless as it forces you to sign in after viewing a couple of pages, and the reviews are written mostly by people who didn't get the job.
As you can imagine, most don't put a lot of thought into writing their reviews, or even recalling what the interview was like.
If knowing about company culture is important to you, you're better off messaging someone on LinkedIn and ask for a quick coffee chat or something.