IMO the Arthurian Legends are just that-legends. Sure there might have been some late-Roman era version of Arthur, but all the stories from Le Morte d'Arthur are stories/legends and there is no point IMO in trying to be historically correct about a bunch of people and events that never existed (at least not in the form that Malory wrote).
I prefer the Excalibur approach to King Arthur. I also like Knights of the Round Table from the mid 1950's. It is stilted and corny and removes the magic from the story; but it looks splendid in 3-strip technicolor and cinemascope.
Dennis: Listen. Strange women lying in ponds distributing swords is no basis for a system of government. Supreme executive power derives from a mandate from the masses, not from some farcical aquatic ceremony.
Arthur: Be quiet!
Dennis: You can’t expect to wield supreme executive power just ‘cause some watery tart threw a sword at you!
Arthur: Shut up!
Dennis: I mean, if I went around saying I was an emperor just because some moistened bink had lobbed a scimitar at me, they’d put me away!
I liked the Dark Age ambiance of Excalibur(even with full plate, but the two best "period" versions were a couple of Brit TV series: the 1979 Legend Of King Arthur the traditional version in a Post Roman Britain, and the 1972 Arthur Of the Britons no legend here.