Let's get some things straight first. This is NOT a true story! The idea behind this film was to depict a feasible Arthur that the legends may have been based on. The basic historical events did occur, but most of this is fictional.
To quote some credible critic, "This is the best movie nobody went to see". The cast is fantastic (Clive Owen anyone?)! Each actor brings realistic emotion to their character and makes each individual's story relatable. Ioan Gruffudd creates a Lancelot unlike any other (my favorite by far). Arthur isn't a perfect king, and Kiera's Gwen is a lot less pretty and proper than expected (you can clearly see that in the cover art).
Though the knights may be hardened by war, they certainly display a very real pain. Though the plot revolves mainly around Arthur and the knights' last task, there are many other conflicts that keep me entertained every time I view the DVD (the director's cut is great, but omits one of Bors' entertaining speeches). The relationship between Arthur and Lancelot is especially entertaining. Bors and Dagonet, despite the obnociousness of Bors and Dag being a man of few words, are the best of friends. Dagonet also grows attached to a young boy as if he is his father (adorable!). Galahad is the young, naive, one who seems to be the only one who has a chance at a real life. Those of you who are quick to cry may find yourselves tearing up a bit at the end as well.
I must also mention that the score, by the amazingly talented Hans Zimmer, is perfect for the mood of the film. It just adds to the generally dark atmosphere created with the use of colorful lighting (unlike anything I'd seen before) and an emotional plot.
I highly recommend King Arthur. Don't believe any of this "IT'S THE WORST MOVIE EVER" junk. Anyone who says that hasn't been to the theater much. I don't particularly like Kiera Knightly either, but I won't lie and pretend that she completely killed this movie. If you can take the time to understand the FICTIONAL plot, you'll really enjoy this.