I'm only playing the campaign so far but mouse movement doesn't feel right. It feels super stuttery or like it will jump across the screen while panning on its own. I don't know if it's the game or my mouse is acting up but it's like you slowly move for a headshot and the cursor bounces passed the enemy.
I also had to turn down many settings due to stutter. I'm playing with a i7 4770k @4GHz and a 780Ti
Feels like this for me as well. I tried using a controller but the issue seems to persist. :/