They give us lots of tense, dramatic scenes--the ones involving Liz and Roger are particularly sharp. Lots of bitchy moments with a smug Cass twisting the knife in Liz and the Mistress of Collinwood firing back.
I love the scene in which Liz tells Cass the best thing she can do for Roger is end their marriage. Way to welcome your new sister-in-law, Liz!