Only because somebody posts a negative article or review about your website is not the end of the world, believe me. People all the time write negative reviews about something they do not like such as online stores where they happen to shop often. This is simply how it is. If a person is not happy with something, he is definitely likely to talk about it on the Internet, especially when he knows that there is nobody to moderate it what he says.
Monitoring an online presence can definitely help keep track of everything that happens on the Internet at all times. When I monitor how my website does and what others write about me on the Internet, I have a chance to actually improve something without that much effort. I am happy to read what others write about me as it gives me some ideas what I might want to improve in my life as well as in my business.