"In a survey conducted by Consumer Reports magazine in 2012, Mediacom is the worst cable provider in the country according to the 50,000 people polled.
The February 2010 issue of Consumer Reports ranked Mediacom amongst the worst cable companies in the United States: 15th of 16 in TV service, 24th of 27 in Internet service, and last of 23 in phone service, based on surveys. The deepening of this trend was affirmed in the June 2012 issue of Consumer Reports, in which Mediacom was identified as the worst-rated company in the United States regarding TV service, phone service and bundled telecom services, and third worst-rated in regards to satellite Internet service. 
See http://en.wikipedia.org/wiki/Mediacom for references.
The problem is that, in most places, there is not a competitor that reaches enough of Mediacom's customers and therefore Mediacom can charge as much as they want to provide the least amount of service, only what is required of them.
Review about: Mediacom Tv Service.