The quality of TV shows has jumped through the roof in the last 10-20 years (although, it could be argued it's regressing again now).
I can remember waiting each week for the X Files & Seinfeld. I'm sure there are a number of shows I could name- but those 2 were standout quality for their time.
Game of Thrones, Sopranos, Breaking Bad....these shows broke the mold open & made TV viewing on par, or superior quality, to film. Quality actors started turning to TV careers instead of trying to break big in cinema- and the production values on these shows escalated. I would name all three of those shows on the list, easily.
For mine, the first few seasons of Game of Thrones, changed TV. And might be my absolute favourite show (even allowing for the wayward end series) of all time.