Breaking Bad

I personally don't really like to watch a lot of television, managing only to occasionally flick through the music channels, however Breaking Bad caught my eye and after watching three seasons, it has to be one of the best TV shows around.

Walter White (Bryan Cranston) is an undervalued chemistry teacher with a lot of debt. After finding out he has lung cancer, he pairs up with Jesse Pinkman (Arron Paul), an ex-student turned junkie, to cook meth to provide for his family after he has gone. 
One of the aspects that pulls the show together is the development of the characters. Walter White's transition throughout the series is TV gold. Bryan Cranston pulls it off incredibly well. In fact, all the cast are suited perfectly to the roles they play. This all contributes well to the story line, which although may seem slow to some people, I think it is the right balance to deliver the drama and tension needed.