It's perhaps for the best that Bethesda's writing is horrible, otherwise BioWare might have been put out of business long ago.
That said, Michael Kirkbride was a good Bethesda writer. He cooked up a large amount of lore and wrote a lot of in-game books. Same goes for Julian LeFay, who practically invented the Elder Scrolls.
EDIT: And indeed, TLJ was great. It's practically the Planescape: Torment of adventure games.