The greatest classic Assassin's Creed game, I don't think too many would argue. Improved and innovated on a very solid gameplay foundation from AC1 and become the blueprint for Ubisoft open world games for the next two decades. Hard to beat that.

100% Completion Notes: Fuck those feathers.
Aside from tedious collectibles, an enjoyable achievement list of unique skills and feats, and clearing a dense city map.