I am very mpressed with this game - they just keep improving on the formula.
If you liked the previous AC games, this one improves on everything. mechanics are better, climbing and jumping is more smooth and better looking. the added trees are amazing - they have done a great job with them. Story is great.
But the sheer size of the maps is amazing. Boston is huge, the frontier is huge and actually interesting with cliffs and mountains to climb and jump around.
The graphics for Connor are fantastic the guy just moves so very well :) Takes a good few hours though before you get to play him.
Very highly recommended.