I watched all the show's episodes (twice) because it resonated with me. Both my parents were teachers. We were a lower middle class family of four living in a small PNW town. In later years, my father would lose the use of his kidneys and had it not been for his insurance/medicare, my parents would have been financially wiped out over the years of his disease, what with procedures, three times weekly dialysis, and hospitalizations. A life time of work and savings gone. Most of us are one major (prolonged) disease from bankruptcy or enslavement to debt.
I watched because I've had cancer. Every person in the audience watching BB, who has had cancer, knew what it was like for Walt to quickly revise his personal priorities and jettison the rest. They've lived some version of that process. Social niceties like 'morality' fall into a gray area, that have more to do with the living than the dying. I couldn't blame him for 'Heisenberg'; the sociopaths he was dealing with wouldn't have respected any ego smaller than their own; they'd have dominated, enslaved or just killed him.
I watched because I'm in no position to cast stones on any of those characters. I've done reprehensible things and know how much work it is to keep secrets and fear exposure. All the adults on Breaking Bad had secrets, an awareness of how many conditions being loved by others comes with and how painful that can be.
I watched because the show was set in what I consider one of the most beautiful places on Earth. There's something about northern New Mexico that I find utterly mellowing and relaxing, a combination of natural elements that was featured constantly throughout the television series, that is best experienced in person. As good as the directors and cinematographers were you really have to take it in with your whole senses to get just how special that place is, and to have such a story set in a place considered a spiritual and artistic mecca was oddly ironic and grounding. It took the story for me from mere well written and acted drama to another level, connecting a very contemporary story to the very oldest kind of human tales. It's like Joseph Campbell came back from the dead to advise on how to write the very human-est of stories.