Vince Gilligan might be the most talented TV writer of all time.#4 is a very tough call for me. At the risk of copping out there are several in the running including Better Call Saul, ER, Deadwood, Hill Street Blues and Band of Brothers. I kind of think Deadwood is incredibly under appreciated. A real, original masterpiece.
2 PERFECT series where he nailed the endings. No unresolved storylines, all easter eggs paid off. Even created an entire series out of a THROW AWAY LINE from Breaking Bad.