I mean, "Political, negative work environment"? Every single group of humans since the beginning of time has a level of political interaction, so when I see comments about things being political I pretty much discount them unless there are some level of specifics. I've also seen folks make the "political" charge when what was really at issue is the person didn't communicate or work well with others, and it takes a level of emotional maturity to realize why this is important.
What facts can you really share though? This isn't a court situation, where evidence is scrutinized and held up to rigorous standards. So what are you really expecting? Transcripts of conversations? Financial documents? I don't really understand what kind of "facts" you would be looking for.
Reviews are all about "how was your subjective experience there." If the answer is "awful, the company treated me poorly," then that's a legitimate review. Why would you discount it?
But, A.) you don't know if these "facts" are true, so they shouldn't really add much weight, and B.) not all situations come down to something so specific and citable. Sometimes, people are just really obnoxious to be around, and they're rude and impatient and temperamental and it's a daily thing and that's all there is to it, and you can't really boil that down to such a nice clean sentence as in your example.
Annecdotal, not factual. And both should be treated with same level of scrutiny.
Anecdotes are not the opposite to facts. They are only opposites to whole facts.
You don't say.
"Political" was my word to sum up part of a lengthy Glassdoor post made by someone else which does not use the word at all. Feel free to substitute whatever word is least prone to cause you a mental hemorrhoid flare-up.
It's the context that is particularly damning. Whenever you see a heartfelt negative review surrounded by obviously fake or reactionary (do you really not see that?) positive reviews, that is a red flag. It is not uncommon.