I am usually forgiving of inaccuracies when creative license is allowed; however, there are some very disturbing errors in this game. For example, the Boston Tea Party was not a major battle as it is in the game.
The game has some other annoyances too. First, almost every viewpoint is exactly the same building. The designers left out any real challenge when it comes to climbing, and the guards are nearly impossible to escape without a fight.
Graphics are good for this gen, and voice acting is acceptable. It is much harder to get into this character. He is no Altair or Ezio, and the storyline seems to fall flat.
The game seems artificially extended by the vast expanse of the frontier. This area is huge, and mostly void of any actions beyond hunting. Fortunately you can fast travel.
This game may break the series, unless you are an absolutely die hard AC fan. Otherwise, skip it and try the next one.