[ocdtrekkie]

I would look at the substance, not the rating, and see how it meshes with their own perception of them. Bear in mind a lot of companies are going to see Glassdoor reviews posted by angry ex employees most of all. How many people stop to post positive reviews of former employers there? And I suspect a lot of tech companies game the system a bit, have a lot of current employees placing reviews, etc.

But ideally if you've met some people there and have a feel for the company, you're going to have some impression or gut feeling if those reviews are right or not. Trust that feeling.