I agree with Eric. I don't know the game and I was pleasantly surprised by this movie (I normally avoid video game adaptations.). In my opinion it's solid adventure-action-fantasy work, it has a coherent fairy-tale plot [princess, pauper "prince," 3 brothers and a father-conflict, a mythical motivation: time - tied to masculinity, the dagger], and I liked the acting for what the movie was trying to be.
Surprisingly engaging, despite the poor casting and unbelievably bad accents (apparently all ancient Persians were white Englishmen). This had some sequences that echoed the video game mechanics very well, and many of the (albeit computer enhanced) locations were very lush and beautiful. It is preferable to look at the film this could have been, rather than harp on the flaws. Oh, and Gemma Arterton is stunning.
Completely incoherent and bewilderingly ineffective considering its talent on board, this visually beautiful mess of a film is proof that perhaps too many cooks do indeed spoil the broth. The list of high calibre talent involved is astounding considering the final outcome. Much of the blame must fall on director Newell's head as he lets some fine ingredients spoil. An out and out disaster.