The Walking Dead is my main favourite show at the moment.
I also enjoy (currently airing):
Once Upon a Time
Game of Thrones
Arrow
The Flash
Agents of SHIELD
Bones
The Vampire Diaries
The Originals
Person of Interest
American Horror Story
The Big Bang Theory
Vikings
Pretty Little Liars
Orphan Black
Hannibal
Doctor Who
Ended shows:
Lost (obviously)
Fringe
Friends
Ugly Betty
Merlin
The Killing (original Danish version and US remake)
I watch too much tbh, which is probably why I always fall behind on everything and need to have binge sessions to catch up when I have time.