Breaking Bad
I watched the first season, thought it was good, but clumsy. Put it down. Didn't pick it up against until after the third season, I think, when everyone was talking about it.
Deadwood
The anachronistic swearing put me off when I caught episodes flipping through channels. Friends convinced me it was worth it. I started paying closer attention to the language. Profit.
Dexter
Didn't watch the first few episodes carefully, but in a group (I prefer watching good television and movies by myself because I'm one of only several people left on the planet, it seems, who doesn't allow my phone to distract me...all but one person in my Sunday group tests my patience, even). Later I went back on my own at the behest of Sherdoggers, actually. I'm grateful for the first five seasons.
Archer
Thought it was just another shitty, snide, thinks-it's-smarter-than-it-is Adult Swim comedy. My brothers and my friends rode me for a few years before I finally gave in. Boy was I wrong.