I really did like the whole Assassin Brotherhood concept, though. In the previous games, it really felt like it was you against the Templar Order without any help. They made you feel like you were the last member of the Brotherhood. But in this game, they extended the concept to the point where it felt like you were actually leading a huge group, the size of which is breathtaking.
The contract missions were done terrifically, your apprentices had this personal feel to them, and when you called upon their aid it seemed much more fluid.
The Altair missions especially, where as an old man you hardly had to kill anyone because your followers did it for you.