I saw some mention carnivale...as awesome as that show was, it can never be considered among the greats because only have the story is told- final 3 seasons were cancelled because it was far over budget.
I have an incredible archive of tv series. I follow all sorts of series from Canada, US, UK, AUS, NZ, DK and Scandinavia.
Canada has just adopted the British model and has been putting out some really great stuff as a result.
The Best Laid Plans (political comedy, a slight comedic homage to HoC) from CBC [hiatus] and 19-2 (police drama) from Bravo [series 1 still airing]. And, of course, HBO Canada's Call Me Fitz (Jason priestly as a womanizing car salesman whose teamed up with a guy who claims to be his conscience), which just ended it's fourth series....hands down the best comedy still being made, anywhere.
I rank US stations as follows for quality series: HBO, Showtime, AMC, FX, Comedy, FOX, then the other networks generally put out mediocre crap though, to their credit, they are starting to put out much better shit in order to remain competitive with the likes of Netflix series and all things torrented.
As far as network goes, the following (kevin bacon), mind games (new series with Christian slater and dj davis from Treme), and rake have all been pretty decent. some others ive been grabbing but haven't watched yet, like Hannibal and the blacklist. also Bates Motel, which is semi-network/cable.
just started watching that new network show Ressurection, and goddamn was the first episode good. I could see it turning out to be garbage in the long run, but the concept is pretty awesome.
US satellite stations have been putting out some damned impressive shit. some others that are currently airing are starz' Black Sails, which has been excellent (far better than the trashy, poorly written Spartacus) so far; House of Lies (showtime's management consultant version of HoC); fx's the Americans (soviet spies infiltrating the us drama); movie network's banshee is alright too (ive only watched a couple eps from 1st season but 2nd season is nearing the close or just wrapped up last Saturday).
I think I might stop watching GoT week to week, considering the same for WD....storylines are too drawn out and watching week to week ruins the show. much more enjoyable when you can watch them in a bank together, esp when the storylines are so drawn out like in GoT and WD (this season at least). I haven't watched TD yet, so im pretty happy I can watch them all in one marathon. other good ones that are coming up soon are Da Vinci's Demons, Falling Skies, Mad Men, Defiance, The Newsroom, Orphan Black, Veep....all of which will be starting up over the spring/summer.