There is almost nothing predictable in “Succession,” a darkly scintillating drama about a great and famous media mogul and the ambitions of his adult children—barely a word about political influence, whispers in the ears of presidents, social impact or any of the rest we might expect, today, from a series about a powerful tycoon with holdings around the globe. Instead, this ferociously satiric series sets its sights on a family at war, siblings in a struggle with one another and with their formidable father. The resulting irresistible entertainment comes in many forms, but there it is, whatever the circumstance. In the...