The game makes up for this somewhat with a good variety of enemies to fight and various boss battles. (cogconnected.com)
As you progress through the story you will fight various bosses just like in the previous Assassin's Creed. (playstationlifestyle.net)
The plot begins near the latter years of the Han period, and each character has their own storylines which often intersect, but the writing is pretty weak and the plot isn't much more than just an excuse to funnel players into various battles with various bosses. (gamewatcher.com)