Someone has to say it: Assassin's Creed II, like its predecessor, was an average game. Once you got over the lush visuals, the missions became a chore, the running around became tedious, and the actual assassinations became routine when you realized that you didn't actually need to be stealthy to carry them out — you could hack and slash your way through guards and still emerge victorious.
What saved the game, in my opinion, was the phenomenal soundtrack that swept the cinematic visuals of the game to the next level. The entire soundtrack, composed by Jesper Kyd is a treat, but I particularly enjoy a track called "Earth" that plays early on and nicely sets the tone for the rest of the game. [Amazon, iTunes]