Customarily I am careful to avoid spoilers, or at least to provide ample warning to protect those who wish to have a pure experience of a work. In this case there is no need, because the work under review is already spoiled. The first half of the first episode of Season 2 of “The Lord of the Rings: The Rings of Power” put to rest any vestigial notion that there is in it anything worthy of associating with Tolkien, or of consumption for mere entertainment’s sake—even in the idle desperation of severe boredom.