Claudibus:what means "average completion" ?
The completion % is correlated to the index of a player's game completion, calculated from the last 100 multiplayer rounds, AFAIK. WGT does not differentiate in the nature of the missed completion, be it voluntary by a player or not, caused by a quitting opponent or due to technical problems in either part of the electronic collaboration.
There are three buttons in different colours to indicate the range of completion %:
"good completion" is green, the best, from 100% down.
"average completion" is yellow, lesser good.
"... completion" is orange or red, the lowest category. Dunno the word...
Given that the last 100(?) rounds count, it is possible to rise in categories by completing more games (1) than failing to complete.
(1) some MP types do not count in, we are told.