Yes, auto loss for disconnect, we should all be on broadband connections on the Wii.
As to precentages - if I score 100 points in 1 hour , and jimmy scores 100 points in 3 hours , I am ahead of him, 100 to 33. If I suddenly have 10 hours to play and score 100 points per hour, and jimmy scores 3000 points in 48 hours of playing I am ahead of him 100 to 62.5 , meaning the best players will be at the top, wether they have spent 1 hour playing or 200 hours playing. The more you play the harder it is to raise that score. The score could be reset once a month, perhaps prizes could be given out (say 100 wii points?)