King Arthur was quite historically correct from the facts and what historians think happened in that time, So how you can say that wasn't really what happened, is rather odd to me when it's a film based around all that.
There are of course some inaccurate aspects, but you find them in most films like this, eg the weapons. People told me they used certain weapons that certain tribes didn't use in those times. Think it was the bow and arrows.
As for the battle scenes, a lot of the 'gory' scenes were cut out just to get the rating they wanted 🙁 and I didn't like a lot of the editing in the battle scenes.
One reason I also liked this movie was because of Guinevere, and the movie going the warrior route with her.