A very well done review, I really appreciated how you took the time to back up each of your points, which were all valid, and your good use of grammar.
I agree pretty much with what you said, except about the sound. Granted, the music itself in Assassin's Creed is either good or just meh. But it's all the other details that makes the sound great, if you ask me. The sound played a huge part in what made these cities seem like real cities populated by hundreds of people. The murmur of conversation, the cry of the merchants, the disapproving shouts as you push through a crowd... all that really added a lot to it. Or maybe it's just me, haha.