Hi @Jerry9
Of course they have value. They help both hosts and guests to get a feel for the sort of host/guest someone is.
For hosts they are one of the key ways in which we can evaluate if the guest is a good fit for us and any red flags around behaviour we might find unacceptable such late night noise or damage to property.
Of course reviews are subjective. However have a look at Airbnb's rules for reviews on Airbnb's Help Centre and if you feel they are breaking these reviews, contact Airbnb.
In the spirit of being part of Airbnb's host community please leave honest public reviews of your guests.