It's an interesting subject....just Thief does it better
At times Assassin's Creed just seems that you are playing through the motions, collecting information through series of timed events, killing your target, and taking the long journey back to your master. It gets boring. Only towards the end do you actually feel the unpredictability of the game. That is if not collecting information is unpredictable. Also, the foggy loading screen is such a blatant cover-up that it doesn't even work.
Assassin's Creed is a forgettable experience. Unlike other reviewers, I just don't "feel" the game. It could've been great, just it doesn't deliver for me.