I've played one or two Assassin's Creed games and they are quite fun, for instance running around Rome and jumping off buildings and the hilarious interactions with the towns people. What was not fun was the pretty terrible stories so I'm not sure how this is going to work as a film...
Through a revolutionary technology that unlocks his genetic memories, Callum Lynch (Michael Fassbender) experiences the adventures of his ancestor, Aguilar, in 15th Century Spain. Callum discovers he is descended from a mysterious secret society, the Assassins, and amasses incredible knowledge and skills to take on the oppressive and powerful Templar organization in the present day.