Yeah this is why I almost always give 5* reviews to any sort of thing that's traced back to a worker unless I really feel like they need to be reprimanded for something, and how badly they should be reprimanded is how many stars I take off. This is only for the 1% who really need a talking to.
When it comes to product reviews on Amazon for example, or business reviews, I feel a lot more free to give my real opinion to help the next person.