Thrones has complicated this in its post-Joffrey period by avoiding a Level Boss-style villain -- someone that nearly every one of its characters can rally against. And few of its characters are so heroic that anyone who gets in their path becomes an adversary by default. Yes, Cersei is diabolical, but she earned genuine sympathy points after an even more calculated religious organization shamed her in the streets of King's Landing and Ellaria Sand murdered her daughter? The White Walkers are pests bent on mass freeze-icide, though their motivations are animalistic at best.
And then there's Ramsay Bolton, currently the show's chief sadist. He has done his best to fill the Joffrey void by abusing Theon Greyjoy, Sansa Stark, and others. But whereas Joffrey could piss off a band of warriors halfway across the continent, the Bastard of Bolton's evil moves rarely ripple into the outside world. Instead, his extreme behavior only serves to test the audience's will.