As I wrote in a review of the entire show, I enjoyed it all the way and took it for what it is, a show where the story is just a mean to recreate the world of templars, describing very well "the feeling of an era".
This last episode was a nice ending to this show, with potential to continue with a second season. I am not a scholar or very passionate about history facts but I have the feeling that everything they did here was well documented and done as much as possible to recreate those times, from the settings to the social relations and customs in those times. Anything but the story which is a 100% fantasy, but than again, they intended the story to be just a support for recreating a historical time.
As a conclusion, I would love to see a season 2 and more such shows made, even with not so big budgets and fuss as some main stream fantasy/history shows.
Thank you History channel!