I notice almost every girl with a review is with a positive one. It can't be possible that all of them had a great time.  Do the guys who were not that lucky are to leave a review?

All guys who booked the escort have a chance to leave a review. Not giving or leaving feedback is definitely up to them. 

Men with bad experiences are disgusted enough that they don’t want to leave feedback because they don’t want to remember how terrible it is with the escort lol.

Or maybe those girls are actually really good with their job and men are really satisfied with their performance? This is also a possiblity you know.