BSG, The Wire, Black Adder, OZ.... other stuff from BBC and prolly HBO I'm currently to drunk to remember and list off...
like bob said, GoT....
not many do... the juries still out on a few... not gonna lie, I absolutely lose interest in most series after 2 or 3 seasons because its the same old stick - but Mad Men is definitely one of them... there's only so much of "oh look at me, I'm drunk and coming up with witty one liners for companies to advertise with" before it gets boring.
Honestly, I've watched 4 seasons and most of 5 and 6 and after the first 2, I couldn't tell you what season a specific episode came from if I re-watched it... that to me, means it doesn't have staying power.
Like I said, definitely watch a season or two, but after that, you're wasting your time