I think my top shows would be (in no particular order):
Game of Thrones (seen seasons 1 and 2)
Breaking Bad (finished season 3)
Lost (halfway through season 5 before scheduling conflicts with the people I was watching it with; hopefully summer fixes that)
Battlestar Galactica
The Walking Dead
Firefly
Others that I enjoy include:
Tremors
Supernatural (seasons 1-5, 6 was decent, 7 has been terrible)
Agents of S.H.I.E.L.D.
Want to see:
Arrow
House of Cards