They're quite accurate from what I've seen. Ask about stuff that concerns you during the interview. If a manager says they don't know, that's a yellow flag. Some of the ratings are from sore losers though, so do ask for the story.

Generally 3.5-4 is workable. 4-4.5 is dream job. 4.5 and higher is very rare, probably has unlimited paid time off, dental, servant leadership, team vacations on work days.

3 and below tends to be at the brink of imploding.. senior leadership is probably job hunting, illegal stuff is going on, etc.