A lot of people stopped liking the show when they left Agrestic but I liked the first 6 seasons of Weeds. The 7th season was bad and the current eighth and final season is equally bad if not worse.Oh and I liked Political Animals.
Dexter was good for 4 seasons. Michael C Hall is still good. And I still have hope for the next 2 seasons because YVonne Strahovski has been cast as a series regular. She will appear in the third episode of this season.I can't remember now when Californication stopped being good. But, I still enjoy it. If Weeds had poor acting in the first season, will it have lasted for 8 seasons? I guess you didn't like it and people have different tastes and likes.