Until DarknessDeath mentioned it, I don't think I'd even considered the idea of a multiplayer component in an Assassin's Creed title. It certainly is a shame that the original Assassin's Creed did not feature multiplayer of some sort but I'm sure some would argue that Assassin's Creed is absolutely perfectly suited to being a single player experience and the inclusion of multiplayer would have ruined it. Whichever side of the fence you sit, I'm sure you will agree that the idea of mutiplayer in Assassin's Creed 2 is definitely something that is worthy of discussion.
Source: Assassin's Creed X
More Screenshots of Assassin's Creed(Single Play Version)