There were a few big deciding factors for me. The big one is that i'm on a huge Ancient Rome kick lately. Marathoned all of Spartacus a few weeks ago, most of my free time goes to Total War: Rome 2, etc... I'm pretty interested in Ryse's MP where I got bored of that lame assassination bs after the 2nd game that had it. I also got bored of all the extra content in AC3... tried to complete all the side stuff and it just burned me out so I ended up not finishing the story for quite some time.