Online is great in this... you are on a quest, you click public games and with that single click you are dropped into a game with people on the same quest. You can teleport right to where they are at in the game world and proceed to melt faces.
In other worlds, there's no matchmaking... waiting for people to be available... and then it starting a fresh game and you start from square one. You can drop in for 20 minutes, and drop back out without ruining anyone's day or session by having to wait for another, and the monsters increase and decrease in power to compensate.
There's no loot disputes or problems, because all of the loot that drops is yours, you don't see anyone elses and they don't see yours. You don't get less loot vs playing solo because of this either.
None of the stupid video gamer stereotype stuff you brought up applies, as PVP hasn't been introduced... which will just be arenas or something.
Fastest selling PC game ever. 3.5m the first 24 hours. 6.3m the first week.
This is how you deliver on hype.
Somewhere, Duke Nukem is crying.