I have a few games right now where people who just signed up joined, and they had no clue what they were joining, and then they deadbeat.
There are two simple things that should be done to reduce this even more than it currently is. First before they can join a game make them read about how it works, I know there is a little bit on this but expand it please.
Next...if a user has 0 completed games and they miss their first turn, then eliminate them from the game at the end of round 1. Simple and quick, saves two days of waiting.