As far as it goes, this article gives an accurate account of the Talmudic background of the Metatron tradition. But, surprisingly, it does not mention the book of 3 Enoch.
Jacobi gives an entertaining performance, but the Metatron of Good Omens has very little to do with the traditional Metatron.
That said, I quite enjoyed Good Omens. All of it was good. The episode retelling the Book of Job is a small masterpiece.
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