Believe it or not... not all bad reviews or complaints are bad for business. If you have thousands of reviews and never had a complaint a normal person will start to wonder because everbody knows it's not humanly possible to please everyone all the time. The key to "Good" bad reviews or complaints is your followup as the business owner. 9 out of 10 times if you make it right by the customer they will respond and put the positive under the negative and that shows potential customers that although your not perfect you do genuinely care and you are human just like them. Many times the person who was negative will now tell people "they screwed up my order but after i posted they went above and beyond" and will actually recommend your business.