This gets 4 stars simply because there are a number of notable cameo performances from a variety of top draw actors as well as charismatic performances from Joseph Fiennes and Eva Green. As for the rest of the cast one can only describe many performances as wooden as the forests in which Britons of the Dark Ages inhabited. Most obvious miscast character is that of Arthur, who not only doesn't look the part but acts as unkingly as is humanly possible, which to be fair is more a consequence of the lamentable screenplays as it is a measure of his inability to pull off a convincing performance.
And this brings me to the script. God forbid the producers of this execrable pile of horse droppings might have deigned it worthwhile to peruse the various medieval writings, or even contemporary re-workings, of the Arthurian Legend for suitable source material but how on earth could they imagine that seemingly making it up as they go along would in any way convince the viewers that the tale is in anyway believable or inspiring.
I have read a few excellent contemporary novels set in the Dark Ages, the best of which is most definitely Bernard Cornwell's Warlord Chronicles series, so it isn't true that there is nothing new to say about Arthur et al. It is a continual disappointment that there are still producers out there who think throwing in a few breasts and pretty faces is all it needs to make a winning production. It does not. We know it so why don't the producers? It takes the sort of source material that is winning fans of Game of Thrones, which though not without it's flaws has a great story, great scripts and great believable performances.
Sadly another missed opportunity.