To the OPs question, I don't think we are getting less tolerant. This place has always been tough. OK I have not been here that long myself, but the history is there to read. The tough tone of UKP give it edge. Makes it OK to challenge WKs or scumbags who post false negatives. Non reviewers are no more nor less welcome than in the past. The only non reviewers that are banned are banned for the same reasons as reviewers. I think non reviewers do get a tougher time (just like always) since it is hard to really know they are punters. I find it very easy to forgive strong words from someone who has TOFTT to help me, or helped me avoid a baddy.
In terms of negatives, I may not read them today. But in 2 months time, I might put spot her on AW, put in her number, and get saved. So yeah, positives I read for ideas, maybe the same week written. Negatives I might only read later. But the negatives are helpful.
And saying (or thinking) that the girls with multiple positives are not really good they are just ordinary and on some cycle of positive rating ... I say no way. Actually it is quite disrespectful to those (like me ) who have seen some 'board darlings' to suggest that my review is anything other than my experience. Ok, almost all have a bad day. But really, I think they get good ratings from so many different and hard to please punters for the reason that they are good at their job.