AusGamers has published an extensive feature looking at the need to focus stories more in games, or allow players to freely discover them, themselves.
From the article:
"...But therein lies the rub. How long can a player be asked to play what is essentially a five-hour prologue? That’s precious time when the player should be connecting with the protagonist, but then whatever connection you have with Kenway is stripped when it’s time for Connor to take the reins. It’s not as though Assassin’s Creed III falls into the category of one of those games that takes on the risky (from a narrative perspective) task of repeatedly juggling protagonists. The opening hour or so of a game is the most important time for characterisation. If the player does not connect with the main character, how are we supposed to care about his or her plight? The short answer is we don’t..."