What Makes a Machinima Film "Good"?

For the sake of the argument, let’s not pull back and simply say that machinima - like every other form of art - is simply too diverse to even talk about the issue. It so happens that there are more and more machinima film festivals and when judging films - what are the criteria to apply? Can you simply put a machinima film next to a classic animation and use the same idea of “good”? Is there some quality that is more specific to machinima and can only be achieved in that format? So the question might also be: what makes a machinima “better” than traditional animation techniques? (Free Pixel)