Glad to see you worked it out after 6 years but yes AW feedback is generally considered to be crap, many of us will have done it where we don't leave bad (genuine) feedback as the girl can then respond and make any old crap up like you asked for BB or smelt and refused a shower etc
If a girl does have lots of positive feedback then it does in part give some assurance that she actually exists and is the girl in the pics who isn't going to rob you, again however if all the feedback is from guys who have only reviewed 1 or 2 girls then these can have been left by false accounts
If a punter has left good feedback and you look to see he has also left feedback for other girls you've seen or names you know / recognise then that's a good guide.
For bad providers the "Feedback only" comments which don't show in ratings are often the most useful and if feedback is hidden then exactly how bad does the girl have to be