The story was fairly throwaway for me. They did manage to get me to care about killing Damien, but otherwise I really didn't care about Clara dying or what happened to Maurice.
I enjoyed the game mechanically for the most part, but just too much repetition. As some others have said, it reminds me of the first Assassin's Creed, but with a weaker story and less focus. So much of the side content was the same type of mission just repeated endlessly. I started this game thinking I may go for the platinum trophy. Now I don't even want to pick it up and play it again, it's exhausted me.