It is an asymmetric relationship. The landlord only cares if a tenant can be trusted to pay rent and not trash the place. On the other hand, the tenant is getting a service (shelter and upkeep) from the landlord.
Like other service providers, an aggregate rating is probably more appropriate. Some people are fine as long as they have a roof and indoor plumbing while others rate 1-star if the water takes a minute to warm up. Some tenants care about kitchen appliances while others care about an updated bathroom. Some like to be woken up by the first rays of sun while others want a dark room to sleep in. It is important for tenants to both get a good aggregate of a landlord’s quality but also understand if the landlord’s faults are ones that they care about.
Tie more positive things to the federal minimum wage, for example tax brackets and retirement fund contribution limits. They go up every single year, so the government will either have to keep raising the minimum wage or go on the record to justify why the ratio is wrong.