“If you are among the learned, you can enjoy watching each of the actors seamlessly switching from one character to another; if you aren’t, you won’t even know who those characters are. Let me be clear: Sellars is a director worth inviting (and, I hope, re-inviting) to Stratford, and this production is worth seeing. But it’s a one-note treatment of a rich symphonic work and thus, for all its surface solemnity, a frivolous one.”