Trauma
The Black Donnellys.
Both amazing shows that I can watch over and over again even though there is less than a season available for each, especially Trauma. Speaking as a paramedic, it was the only show/film I know of that has ever come close to accurately portraying EMS in the real world. Everybody else just half-asses it. It's like when you see a good military film like Black Hawk Down where they actually know what the hell they're talking about. We do a lot more than drive people to the ER.
Who is in charge of cancelling shows at NBC? Absolutely horrible.