http://www.huffingtonpost.com/2014/04/29/hill-street-blues-dvd_n_5232710.html

"'Hill Street Blues' was the first TV show that I perceived as being 'good' in terms of quality, not just entertainment,” says “Bones” creator Hart Hanson.
Read more at http://www.hitfix.com/tv-tattle#FBEMlSMYESedFd7E.99

Was "Hill Street Blues" really the first prime time drama to serialize? (http://boards.straightdope.com/sdmb/showthread.php?t=742786)

It was second to Dallas.