Some people say you should never respond to poor reviews as that makes the negatives stand out among the positives.
I disagree. If you dont respond then it makes it look that you dont care.
I have only one poor review in my Ebay shop and that was due to a customs delay at the other end in dealing with the package. So I felt it important to post that some things are entirely beyond the seller's control.
In another of my shops a buyer stated that she received "poor communication" despite a prominent notice to the effect that I was closed for vacation. My response made it clear that the issue was dealt with immediately. The next buyer to leave a review made a point of saying that the help and communication she had was excellent.
When you get one or two bad reviews amid mainly good ones it says more about the reviewer than the business being reviewed. Often the complaints are fairly petty or they refer to matters the company could not be held responsible for - such as bad weather/strikes/etc.
Our Welfare State. Is it broken?