Sometimes, a little bit of editing/camera work and different character models can make a world of difference to the same bit of animation.
1. For instance, here's a fight scene I shot in an introductory motion capture class applied to generic off-the-shelf characters (the old man is actor Kevin J. Ryan and the alien is classmate John Helton):
3. That looked ok, so I spent some more time on the camera angles to previz the sequence as it might take place in the film:
4. Hmm, what about with tighter editing, better looking characters and some lighting?
5. And here's the final sequence:
All through this process, the actual animation on the characters was unchanged.