It takes me a little while to get into a TV series, but once I do I am usually binge watching it until the finish. I recently got hooked on The Sopranos (yes, I know I am late to the party). Before that it was The Office, SOA, Boardwalk Empire, etc. I would have to say The Sopranos has been my favorite so far.
What's yours?
Here is a list of the most popular: http://www.imdb.com/search/title?title_type=tv_series