I feel like since Glassdoor has a job board, there is an obvious conflict of interest that cannot be solved and ultimately yields to the company review part to be mostly useless. If you browse through a few company profiles, some that offer jobs on Glassdoor (and reply to reviews) and some that do not, you will quickly see what I'm talking about.

I mean, who is going to post job offers on a board that also list your company at <4 stars with plenty of mention of "bad company culture" and "horrendous working condition"?

I also do not like how most of the would-be-intersting-info is gatekeep behind you sharing various info on your own employer. I mean, it seems to make sense on the surface, but with the above, the whole thing feels like a scam. Where both employers and employees get scammed.

How does it compare to alternatives ? Well, LinkedIn is terrible, with abysmal search function, results completely irrelevant to your profile, and the same seems to be true for recruiters seeing how often I'm proposed jobs completely outside of my skillset.

So I guess Glassdoor is a viable source of job offer, especially if you have already selected companies you'd like to work at and those companies do not have their own board. But take all reviews and comments with a huge grain of salt.