So what do I love about these? The pacing, characters, dialogue, and storylines ... Sometimes the characters stay with you for so long you find it difficult to cope when they are off the shows (Elliot Stabler, Will Gardner, Kalinda Sharma ~ every governmental institution ought to have a few Kalindas.) I also wish to especially point out LINE OF DUTY (BBC) because its pacing is incredible.
And whenever I feel a need for a jolt in work motivation, I go to these two series, both from Aaron Sorkin: THE WEST WING and THE NEWSROOM. I might not always follow what they are talking about (especially politics), but they always get my blood pumping good.