Omg the Dexter = Gaga analogy is kind of spot on. Amazing first few seasons, than the original writers left (= Gaga's original team of Boomkack/Dada/Nicola/RedOne/etc) and it went to hell
Britney = Glee. Huge peak but only liked by the gays and girls, massive frontloaded power for a while (the time when Glee songs always made the top 10 on iTunes) but ultimately forgotten and erased from memory like it never happened