Was a brilliant show, one of the best ever, not sure why Walter White constantly gets dubbed as the series 'protagonist and antagonist' though. Sure he did some terrible things but protagonists and anti-heroes from other shows and media commit just as bad acts and seem more inherently 'evil' and don't seem to get labeled 'antagonist' ( I'm thinking Al Swearengen from Deadwood and Kain from LoK as the 2 that spring to mind first but there are tons obviously).
Maybe it's th fact that Walter started out as such a white-bread, mr. nice guy perhaps?