The biggest issue I see coming up in this thread in particular, is the attribution of demonic nature to these lifeless items of media. When we focus so much on crediting satan for things, it can become a sinful distraction from the opportunity to be examples of Christ. Similarly to that of video games, or GI joes, Barbies, pets, work, math, imaginary girlfriends..etc. If God is anything other than our primary concern, then we are astray and need to come back, regardless of the means.
As far as Assassins Creed is concerned, I've not played 3 yet, but there is a unique instance in the series. There are multiple tiers of storyline. Whereas the main overall storyline is goofy as no other with the alien race with the names of mythical gods and goddesses, as well as genetic memory, The sub storyline (at least from AC2- Revelations) is quite intriguing. Mostly due to the main character, Ezio Auditore. The biggest thing that grabs me though is the game play. No other game plays like it with the climbing up buildings and running across roof tops. It was lessened in Revelations admittedly due to the absurd complexity they added to the controls, and the closer relation of Ezio's storyline with the goofy main story. So I never finished that one as I lost interest. I enjoy Skyrim, and I love the storyline for the Halo series (up through Halo 3. Reach took a poo on the story, and Halo 4 went some awkward alternate universe direction. Both are good games in their own right though). I find COD incredibly boring, with exception to the Nazi Zombie mode, simply because of the arcade feel. All that said, I don't really play video games very often anymore.When I game, I labor, and there has to be a good reason for it. So if I already know the story, and that's what drew me to the game, I have no reason to play it. If it's game play that I found intriguing, then I might more often return to it. That's of course assuming that's what I want to do for recreation. I'm an old man now.