MoCap isn't the 'end-all & be-all' that some people hope for. If the model you apply it to, doesn't have the same demensions as the person that was MoCapped, the movement won't translate as well as it could. Twiching. Things bending wrong, etc.. It makes a mess of keyframes. All rotations, for every joint, on EVERY frame of the animation. It's an absolute mess to edit. A lot of the CG and video game houses usually do their animation by hand. In the long run, it takes less time and tends to look better.