I'm a old DAOC (Dark Age of Camelot) player, and I really enjoyed the open world 3 faction pvp and siege warfare with hundreds of players fighting in the same area (yes the lag was real, lol). This open world and siege warfare may be a good idea for a grand company alliance pvp system (24v24v24). I understand something like this would be a big undertaking but am sure it'll be really enjoyable if done right.