Some games allow just about any player to kill any monster alone, given the tactics or perseverance.
For instance, EverQuest generally required 18-40ish people, depending on their levels, to kill dragons. The optimal way to hunt big monsters in Anarchy Online will probably be a well-rounded team of 6 characters. The more the merrier, but a lot of the reward system and balance will make the classical role-playing party very efficient and fun to play. In addition there will be big monsters that will take the cooperation of several teams and players to bring down. Let me add that there is still more tweaking to be done on this.