Boardwalk Empire by a long margin.
Mad Men - always excellent.
Ray Donovan ended a lot stronger than I thought.
Sons of Anarchy - this is my campy pick.
Tyrant that was on Fx was excellent.
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Longmire I like, but it's hurt by being a A and E show.
Power was decent, but there were ffwdable portions.
I'll still stop for The First 48.
Walking Dead is a second stringer for me at this point too.
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Worth a second watch after a few years -
Luther that was on the BBC.
Ripper Street that was on the BBC.
The first 3 seasons of a the Australian show "Underbelly" .
Treme was a strong show that got overlooked a lot.
Homicide, I finished rewatching this a few months ago, excellent show. Doesn't feel dated for a cop show, much like a prologue to "The Wire", and David Simon's later work. Tiny bit hurt by being a network show, but what can you do.
Also doing my yearly Deadwood rewatch.