With listing agents, it is very clear which agent is the listing agent. With buyer's agents, it's not always so clear. A potential home buyer who handed out a one-star "review" was insulted that I would not continue a conversation with him and provide more free advice. I had already told him, numerous times, that I could not give him advice when he is working another agent. Per the Code of Ethics.
That didn't matter to him, because he alone decided it was OK to talk with me anyway. When I refused to answer more questions and said I had to go, he decided to find a review site somewhere so he could slap a one-star on my page. Because he was so grateful for the assistance, you see. Or, he thinks with his pecker. Hard to say.
You can read more in my personal blog today at this link: To the Sacramento Realtor Struggling Over a Buyer Broker Agreement.