A completely regret buying this. I had read that the mouse issues were overinflated or had been fixed, but no. If you put the mouse sensitivity to 0 and ramp up the DPI on your mouse it is tolerable on weapons without a scope / zoom. However it is still a total mess on anything with a zoom. I have no idea how this is such an issue as I thought this was largely just updated Human Revolution tech, but I guess not. I can't recommend this game unless you want to play it with a controller, which it was clearly designed for.
