Ah I see thanks for expanding on your point for me. I agree with you, I myself have only been an active member for a few weeks and I can see where you are coming from. I made a mistake with one of the first mini reviews I completed. It didn't have any structure and I put a very silly subjective comment about "clicking" with a WG which was jumped upon by some other members as being negative. When in reality the punt was very good.
That was a mistake I learned a lot from and hope my reviews in the future will be clearer to other punters. Think many lurkers who then post will have the same problem at first until they settle in. I did start a thread about having a more standardised review template to help with structure and clarity but the response was that the vast majority preferred the free style way reviews are completed on here as opposed to AW field reports and auto-censored.
Reviews on UKP are very important to me as they feel more independent and honest than most other punting sites which often have an agenda to promote. I would also be suspicious if a new member posted a single review and then did not actively contribute in other discussion. There is always a possibility that a WG/pimp may join solely to tout or attack their competitors. The bulls hit radar of the admin/mods and the more experienced members in very acute and I have seen many of these people caught and shot down very quickly.
I believe that reviews on this site are massively helpful but only part of the bigger picture I still would do my homework before booking a new WG and try to read between the lines of a review and only focus on the facts and not subjective opinion.
For example level of attractiveness is very subjective, I like slim red heads you might like curvy blondes both are equally valid choices. Where I think multiple reviews really can help is exposing dishonesty such as likes not not being available, scams, bait and switch and a poor attitude.
So can new reviews by lurkers be trusted, no, not on their own but as part of a larger solution then yes they do indeed have value. After all we all started with a first post and a first review hopefully people will stick around long enough to learn from their mistakes and go on to produce more relevant and valuable reviews as time goes by.