Ubisoft, the company that created Assassin's Creed, worked very closely with the Bostonian Society and other historical societies to give mid-eighteenth-century Boston an accurate feel, right down to the colors of the buildings. The result is a fabulously detailed and historically accurate cityscape. Below, you can compare a historical map of Colonial Boston to the in-game map by sliding the divider back and forth. Alternatively, here's a side by side comparision.
Do you now disagree with your original claim based on this evidence? In other words, do you believe that the developers did a good job with researching the time period, and recreated Colonial Boston in a way that is valuable to our understanding of history?