A good player is someone who knows what their joints are doing, why they're using those joints, and can plan several moves ahead to gain the advantage of the match.
A good player to me is:
ingame skill:
Know how to look realistic.
Can spar.
Understands how to do moves tht you can do in real life.
Can play aikido an other mods decently.
Doesn't run even when he's winning.
Personality:
Funny
Willing to share some of his knowlege to the nubs
Nice
Respectful
Respected
Pretty much that. I would add that a good player is able to have a clear sequence of attacks, defensive moves and comebacks which are not interrupted by time wasting movements like wobbling around (if that's not already what you were talking about, Holo).
This is the reason why duelers are often considered as good players, because they tried/learned to get the highest efficiency in each of their moves to beat the opponent as efficient and quickly as possible without getting into a position where they are not safe.