But Tywin's plots are rational, there is strategy to them. The essence of Joffrey was his irrationality, his almost careless brutality - like the dead white doves left behind in the pie that he had opened with his sword.

Sure, but Ramsey doesn't really interact with the others. Joffrey was in a position of power, with powerful support, affecting the lives of many.

I'll miss Joffrey! He's one of the great unrepentant villains. Who ya' gonna boo, now?