Honestly, I think The Sopranos Seasons 1-3 were among the best of all time, but not the remaining seasons. If we're looking at complete series, I would put The Wire just above The Sopranos.

Here's the list:

http://www.wga.org/content/default.aspx?id=4925

Some of these shows are too low -- CYE, NYPD Blue, Homicide and South Park. I disagree with Law and Order, Roseanne, Friends and Will and Grace on this list.