A vast improvement over the already fantastic original title.
While I've made this particularly clear in the past, I'll say it again now: I love Assassin's Creed. I purchased the first title for the 360 on somewhat of a whim, not expecting much, and completely fell in love with the game's mechanics and the beautiful environments. Of course, the game did suffer from some repetition problems, but given what I enjoyed about the game, it never bothered me to any great degree. As a matter of fact, I nearly completed 100% of the game, aside from finding all of the flags.