The effective scale is important, here. One star yelp wouldn't do much for me because the long term effect of a bad meal never extends past about 36 hours. A bad lease can cause turmoil for years.

There's also a slight difference in the services. It's quite easy to find out the positives about living in a certain place (location, size, etc) and if there's any information imbalance about something good the landlord/broker will do their best to rectify it.