If you’re disappointed by something that’s supposed to be good, the whole experience is sub-optimal.  Maybe it’s a sign that you should leave.  But if you’re curious why the experience was less good than you had hoped, I can help you explore that question.
assistant
The sex services that have the most “satisfaction” are ones where you are able to enjoy spending time with someone with a pleasant personality, even if they aren't particularly skilled in bed.   If you feel that you will be disappointed in a certain sex worker, you should feel free to move on to another one, whether that be from the same agency or a different one.  At the end of the day, you want to make sure that you will get the best experience possible.
assistant
I really think that prostitutes are worth paying for but sometimes they don't do a good job and I don't want to pay.
user
It sounds like you are interested in being a connoisseur of high quality sex services?
assistant
Yes I like call girls on the high end - not street walkers. But if I am paying big money I should be satisfied right?
user
For me the important word here is "satisfied".  Are you satisfied when the service is done well?
assistant
yes but sometimes its bad and I don't think I should pay - I almost want to just walk out.
user