There were so many flat, undeveloped characters in key roles in Breaking Bad. The only villain any of us cared about was Gustavo Fring. Otherwise, all the other characters were throw aways.
There were two main plots that Vince Gilligan could not get tied up together. They killed Fring a season too early so they had to invent new pointless enemies with no actual stories to finish the series. All that so they could figure out how Hank learns about Walt. They missed big time.
I understand why you and many others think Breaking Bad is the best show because most of these people have lived on a diet of bad television. When you have seen The Wire, Sopranos, True Detective, Fargo, and the like you realize that it is far from perfect and not deserving of "the perfect show".
Truth is, the Sopranos is the greatest show in TV history. Every character they "insert" into the Sopranos is even more developed than Anna Gunn's terrible portrayal of Skylar White. In fact, outside of Walt, Pinkman, Fring, and a (completely flat) Saul, there really wasn't a worthwhile performance on Breaking Bad.
Meanwhile Tony, Carmela, Meadow, AJ, Paulie, Vito, Ralph, Jackie Aprile Jr., Junior Soprano, Christopher Moltisanti, Bobby Bacalieri, and Johnny Sack are all further developed than anybody besides Walt and Pinkman.
Stop pretending Breaking Bad is the greatest ever. It's not. It borrows heavily from better portrayals of real evil and suffers from a severe underdevelopment of key characters. The show should have been left more open ended, instead of introducing more and more flat enemies we're supposed to care about.