I don't put a lot of stock in the star ratings, but I do read the reviews and draw conclusions about whether someone is worth speaking to on that basis. A late-returned phone call or a failure to respond to an initial email would not bother me, but a missed interview or last minute cancellation for a flaky reason would. I've read reviews where the poster noted that, even after the prospective employer called the would-be nanny after a missed appointment to make sure there was no misunderstanding as to time or date, the nanny did not bother to call back. To me, that kind of behavior reveals a level of irresponsibility that is unacceptable to me. Given the volume of qualified applicants out there, I would not bother with such a person.