TV-shows are not my favorite entertainment. I don't like them very much. But I've seen some through the years so I have a shortlist of those that I do like:
Married with children
X-files
The Twilight Zone
Seinfeld
The lost room
Black mirror
IT-crowd (UK)
Misfits
Mad men
Breaking Bad
Well, if we are going all-time:
Comedies (in descending order):
Seinfeld
Curb (since the divorce)
Arrested Development (first 3 seasons)
Get Smart
Dramas (too many to list but what really sticks with me, in rough descending order, excluding GOT, which is its own thing):
The first season of Homeland
The Americans
The first 7 episodes of the first season of True Detective
The first 3 seasons of The Sopranos
The first 3 seasons of The West Wing
Dexter season 4 (Trinity Killer)