It looks to be quite a level above your typical video game movie
From the top notch actors involved to the impressive period sets and costumes and the well orchestrated choreography I've got to say that this is the first movie based off of a video game that actually looks like it could be good. I'm a big fan of Michael Fassbender and I'm sure he'll be terrific in this (I've heard he'll be speaking Spanish for over half of the movie, which is interesting to say the least), and the rest of the cast looks good too.
Assassin's Creed looks like a movie that someone actually wanted to make, that people had a vision for and were earnest about crafting a good film, rather than just a studio attempt to crank out a movie sold completely on the recognizable name of a popular video game. I am not familiar with the Assassin's Creed video game series as I don't play a lot of games, so I can't say how "in-tune" with the video game series it is, but from a story telling and film-making perspective this looks very good. It could open the door to a whole new level of quality in video game movies.