a few years ago it was Avatar the last airbender, then it was a few dramas and sitcoms. can't name any on the top of my head since i don't really watch that much tv anymore.
I only really watch The Inbetweeners and Big Bang Theory. I'll watch almost any animal documentary though, I have so many Nat Geo programs downloaded. xD
South Park, Beavis and Butthead, The Simpsons, Six feet under, Family guy, American dad, The Cleveland show, Teen mom, Big bang Theory, Dr House and some others I don't recall right now.
The only show that I bother to watch anymore is Walking Dead. I used to watch Heroes before it ended. I don't really watch TV per se... I watch everything online. Walking Dead is a bitch to find online though.