At this point, there may be no hands-off preview I'm less willing to trust than an Assassin's Creed demo. Last year, Assassin's Creed III just looked so good, so full of potential... and the final product was a mess. So when I went and watched a big chunk of Assassin's Creed IV: Black Flag in action, I did so with a massive grain of salt clutched in each hand.
I was sorely disappointed by Assassin's Creed III. The game was a jumbled disaster, and almost entirely unfun for me. And yet when I saw it running at press events and last year's E3, it looked fucking amazing.