Using Motion Capture (or Performance Capture) is basically 21st Century rotoscoping. I don't call this animating...it's special effects. The process of taking the movement of a live actor's performance and transferring it to a design created in computer, is basically no different than encasing something that already has been recorded with a layer of effects to enhance its appearance.
Animation is feeling the movement within one's self and imparting it to a design through your pencil, stylus, or fingers.
Motion Capture is just a new form of tracing...on film instead of on paper. Yes, the technician layering a graphic design over the frames of Motion Capture has to manipulate the design at times...but that is the same as adding an effect, not creating the performance from scratch.
Animating is creating from scratch the physical performance one sees on the screen. Just as a live actor does, an animator feels the emotion within him/herself, then projects those feelings as a performance on paper or the computer screen.
Okay, I open the floor to you for your comments.