Perhaps this movie means more to people who have some kind of attachment or attraction to the King Arthur legend already. That's the only way I can explain how so many people are giving this movie gushing 10/10 reviews.
For me, it was a largely vapid CGI-fest completely devoid of realism or reality. It's pretty much on par with your latest superhero / Avengers type of movie, with fast cut action sequences, explosions, things flying around the screen, and stylized slow motion. I expected more than this from Guy Ritchie.
I also didn't expect it to be so much of a "fantasy" film. I was expecting / hoping for a historical action movie but there is almost no history here. Everything is stylized and made up. The armour and weapons are all made up, the castles are unbelievable and fantastic (huge towers, arches, 1000 ft bridges, etc), African and Asian characters have been inserted, and there are almost no historical references.
So it all kind of mashes together into 2 hours of fantasy-action featuring characters you don't really care about and that have no grounding in any reality that seems to make sense. And you can tell they want to turn this into a franchise with several more sequels. Thankfully we may be spared this horrible future as I hear it's bombing at the box office (there were 2 other people in my theatre). It's a bad film I would never want to see again.