Hmm, somehow the forum ate my post.
I think Game of Thrones deserves a top ranking, it's definitely broken new ground for a fantasy epic in terms of scale.
I'd also go with The Wire, again, groundbreaking in a lot of ways and the shifting focus between different groups in the city, the police, the drug dealers, the press, the schools, city hall, etc, really helps it rise above.
The original Law & Order deserves a spot, especially the episodes with the original cast.
The Expanse has been groundbreaking as modern sci-fi.
Star Trek DS9 really brought Trek into the modern serialized era, and showed the darker side of the Trek universe without completely losing the ideals and hope that Roddenberry envisioned.
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