A great visual experience but...
You're Altair: a highly skilled assassin with awesome moves to show and a rather bad temper...(just the name itself is pretty badass.)
As the missions are assigned to you and as you, graciously or not so much, eliminate the targets, you start to get a rather uneasy feeling that translates in " Is this it?" . And yes, unfortunately all you really have to do is kill the targets so this kind of limits the potentials of this game. The combat system is great and challenging, and as I said before, just the vision of the environment that surrounds you will really make your eyes pop but the story itself could be "more".
Still, a great game that will give you some good hours of fun if you're really into the fighting but if you're a gamer that looks for a certain degree of depth in the story, i advise you to rent it out first and try it out for a couple of hours.