I'm not crazy about Frain's voice as Sarek. He sounds almost as if he's narrating rather than speaking in a character role.
Good description of it. There's something missing, almost like Frain is bored. He's drained Sarek of all emotion. Whereas I felt that Lenard and Cross subtly placed emotion in their voices and performances as Sarek. It was there, just below the surface, in how tightly they spoke for example.