A messy fusion of Lock Stock and Two Smoking Broadswords with the reheated leftovers from Game of Thrones, Lord of the Rings and Harry Potter; clumsily draped over a skeletal retelling of the Arthurian Legend. A forgettable cast including Charlie Humdrum (kissing goodbye to his Hollywood career), some token ethnic sidekicks; a scenery chewing Jude Law, Littlefinger, and the cast of The Football Factory. If that sounds 'different', trust me it ain't. It's as generic as it gets: a tiresome origin tale; McGuffin-based storytelling; a frenetic mid-film set piece that results in a death we're meant to care about; reluctant hero loses faith only to get it back (yawn) and the obligatory plan to storm the castle (not a spoiler) followed by a dreary battle scene ending in a climactic boss fight straight out of a videogame cut scene (difficulty level 10); before a smug epilogue sets us up for a franchise that I can confidently predict will never see the light of day. Think this is getting a sequel? You're 'avin a bubble.
What about the banter? There is some, and it occasionally raises a smile (I liked Michael McElhatton's cameo) but for the most part it falls horribly flat and invokes embarrassment rather than amusement. I can see why it bombed harder than an asteroid. Some of the fantasy stuff is good (liked the mountain-sized elephants) but its nothing we haven't seen before. Basically, it's just boring, and its easy to see why this sank like a stone stateside.
In short, don't got to Camelot. It is a silly place.