The original version of the KJV contained the so-called Deuterocanonical books. They were later excised in most editions by various Protestant groups. Setting that aside, Fr. John points out, correctly, that the KJV is not an especially bad translation even today. It has stood up rather well for a 400 year old work. And it occupies a place in the top tier of the English canon of literature. That said, there are very few English versions of the Bible that are well suited from the Orthodox perspective since the Orthodox canon differs somewhat from both the Roman Catholic and Protestant canons.
So which Bible do the Orthodox use?