I do not think that malicious reviews are a big problem. They can be challenged by the escort and the poster requested to give verifying information.
What I call "self publicity" reviews by escorts are a bit more frequent and misleading.
What should be minor problems are exascerbated by the shortage of genuine reviews. There are escorts who have been operating for months and never been reviewed. I reckon that the review rate could be as low as 1:250. If there were more genuine reviews the fakes would be obvious. The blame lies with the punters who use the reviews but could not be arsed to post reviews themselves. I admit I was one for a long time. I think the problem mainly lies in punters being too lazy to register so I think that it is only fair that you should have to register before you can see reviews. If you look at the bottom of the community home page you will see that there are a lot more "guests" viewing the pages than there are registered members.
On a separate point, I never put the correct time and date on my reviews to disguise myself. The reason is that I like to be able to discuss any downsides to a session but be able to visit the girl again without getting a hard time over any negatives.
If I see an escort that I knew before I started reviewing, I will post a review but state that it may have been some time since I saw her.
Sometimes you see an escort but her profile vanishes before you can make a review and it could be months before she reapears.