Mr Light wrote:
I like these kind of morally ambiguous shows, but it's important for me that the "hero" does horrible things for a noble reason. Like in The Shield or Dexter. I could never enjoy Sopranos because the "heroes" were no better than the "bad guys", they had no morality. So in addition to just making money for his family, I'd love to see Walter work with the DEA to take down other drug lords or something like that.
As others have hinted, this is not that kind of show. Creator Vince Gilligan developed the character of Walter White with the intention of exploring a very specific kind of dramatic arc, and what you suggest would muddy it. You'll have a better ride if you go in without expectations.