One word: tedious.
The interesting guy wasn't even the main character. And to tell the truth, he wasn't really that interesting. Most of his story is told through Quick Time Events - push this button and watch another scene. Don't bother to explore the world around you - we're trying to show you a movie here.
Heavily scripted and no idea what to do at times. I feel like I missed a lot, but that didn't matter because you were suddenly someone else in a completely different map.
I didn't get the hunting bit, and I stopped playing the game after trying to trap a deer for the umpteenth time and running out of bait. Restart - frustration - no direction as to what to do.
Yes, it was so frustrating, I stopped playing the game I had played since Assassins Creed II captured my interest. I even slogged through AC I, after AC 2 impressed me so much. I bought Brotherhood and Revelations, and even tried out the free-for-all MP for a bit, until I got tired of Level 50's with better toys and lag switches beating on me.
And now they're coming out with a Pirate next year. All they need now is a construction worker Assassin and a traffic cop Assassin, and they've got the whole set.
Major disappointment, Ubisoft.