So...what you're saying...is really...that you DID have control issues?
Joking aside, it's a common problem in crappy console to PC ports. I actually enjoyed Dead Space quite a bit, but dealing with the controls was such a heavy piece of the game that I would argue I played a completely different game than the console players did. Additionally, it got worst the faster my system became - another "joy" of Dead Space.
Improved mouse controls can only be a bonus at this point. The hardest part of the game was just controlling it. Thoroughly unimpressed with Kinect, Ray