Lily, I believe the vast majority of guys on here post reviews because they had a great time. And a few post when the sessions are not good. Do some, if not most, embellish to some degree? Or look back through rose colored glasses? Sure. And that's OK to a degree.
The OP asked about WKs. There is a small but very vocal group of guys who jump to the often unneeded defense of who ever their current infatuation is. They also aggressively attack guys who are expressing their opinions about a provider. Not due to malice but simply what they believe. There is also a small group of guys who pounce on every guy who states a view that supports a provider as a white knight It does not matter how well supported through facts the poster may be. Any support given to a provider that does not fall in line with the views of these few guys is a WK talking.
These activities have the effect of making some guys, and sometimes, providers less likely to post valuable information because they don't like being attacked for their views. This small group of guys try to use intimation to stifle opposing views. Kind of like Obama and democrats in congress.