Personally, I like the idea of 20 man raiding. Because seeing the amount of Heroic 10 Man Guilds right now, compared to myself in a 25 man guild having downed 5/14HM so far, the difficulty is definitely much harder to play. More communication than 10 man guilds. No wonder 10 mans dominate more heroics than 25 man guilds. On ya, Blizz.