My opinions...
Original Deca - too long (much too long) 3-4months max.
As to games, I will participate if I like the games... I suppose more people feel like that - so popular games are inevitable...
10 "forgotten" games is not that good idea.
Games like gng - in AD2003 - I hate it. I hate the settings - (death, satan, loki,...) - I hate horrors. Won't play in any more Deca if it has such title. sorry.
Games should represent a large variety of games... platform, shooters, racing,...
AD - much interesting that the original.
No 24h rule - no sense - no way to check it.