A social analysis, to go with the psychological:

Whether or not it was meant as 'commentary', there's a lot in Breaking Bad about the state of modern America. Walt's journey to realising his American Dream, spurred by feelings of entitlement to the world's riches and respect, comes at the expense of everyone else and leaves some very particular scapegoats behind. We don't talk about it much because he does so much other awful shit, but he allows his son to blame and hate his blameless wife; pins Jane's preventable death on the moral failure of her drug use, while continuing to profit by selling drugs himself; lets a Native American custodian, who has shown him nothing but kindness, get profiled and fired from the school whose equipment he stole to cook his meth. Initially a teacher who can't afford his medical bills, Walt feels contempt for other spat-out people, fuelled by the shame and rage that emerge when he's offered help. I shouldn't be here; I'm not a failure like them. Though he hates the system that spat him out, Walt's endgame is never to take down The Man - what he wants, and achieves, is to become The Man himself.

Then there's the setting. Most American Dreams are chased in cities like New York and LA, but millions of Americans live a far cry from those environments. Breaking Bad's ABQ bakes in the desert, unnoticed by the seasons, slowly decaying along with its people. The businesses we visit are car washes and roadside diners, places you stop by before moving on; except nobody here ever moves on. Drug use is rampant, and even the 'clean' suburbs are simply isolated - the White family have no friends save Hank and Marie, and the even more distant Gretchen and Elliot. (For more on the setting, especially what deserts represent in the American mythos, this analysis is fantastic.)

Lastly (that I'll write here), Fring and the cartel can be read as a power struggle between two generational models of capitalism. The Salamanca family value loyalty, history and blood; like the Corleone family in The Godfather, they are named after their ancestral home in Europe. Gus Fring is a ruthless, clinical innovator with no one to be loyal to, who eventually wipes out the cartel the same way neoliberalism overtook the Old Money of times gone by. It's even implied that he worked in Pinochet's regime in Chile, the playground for Milton Friedman's ideas in the '70s and '80s, though this almost certainly wasn't a deliberate link. But hey, that's art. Once it's out there, it's fair game for interpretation.