A lot of good points here. I only went with hour long dramas with continuous storylines, but if I were to include 30 minute shows South Park would be near the top of the list.
Dexter didn't make my list despite season 1 & 2 rivaling any show I've seen. But the fall off, particularly in the last two seasons, took it off the list. Similarly, Sons of Anarchy had its moments, but the fall off as well as the extent to which it relied on "torture porn" kept it out of the top tier for me.
The Sopranos gets a lot of credit for blazing the trail, and it was a good show, but having watched the full series for the first time last year I didn't think it lived up to the hype.