The biggest problem that Miki 1 and 2 had were the joints.  The elbows and knees still seem to bend in a bulbous, unnatural fashion.  This was my biggest problem with Miki 1+2.  You could use the face, but if you put them in a short sleeved shirt or a dress, they looked terrible when they did anything except stand still.

 

 

Miki 3.0 seems to have the same problem.  It's pretty evident in the render that Synthmonkey did that I'm linking here.  Miki 3.0's knee is elongated, totally distorted, and looks completely unnatural.  Seems like the same problems Miki 1+2 had...