I'm not sure I can answer this anymore. I would have said The Walking Dead, but it seems to have picked up recently.
Probably Supernatural. Completely watching out of habit at this point.
It used to be Revolution, the US show about nanobots stopping electricity working, or something along those lines. So bad, but I kept watching.
Under The Dome.
Somehow made it halfway through Season 2.
God knows how/why.
I've been made to sit through Hannibal. It is so painfully "trying to make out it's clever but actually really really dumb". Very stylistic and very gory, even by my veteran horror film standards' so big marks on those fronts. Turn off your brain and you might enjoy it.