At the bottom of the review form is the dreaded "Yes" or "No" button. I find myself wishing for some more in-between options, or a free-form field instead of or in addition to the two-way button.
I've had sessions that were OK, but not all that wonderful. Maybe it was bad chemistry, or maybe one of us showed up late and put the whole session under stress. Maybe the moon was in the wrong phase. Would I recommend her? Often the answer is "yes and no" or "it depends on how much I like you!" Sometimes she was OK, but she wasn't great. I'd like to be able to indicate that. "Yes" just sounds like a 100% endorsement, and "no" sounds like a 100% rejection.
I also suspect there are hobbyists out there who wouldn't pick the "no" button unless the provider actually set his pants on fire (and not in a good way) or gave actual birth to a child during the session. Providing a third option might get a little more honesty in the review's arguably most important section.