The scenario above that you listed, is again the wrong way to play. Group with them...you can kill much faster and be done that much quicker, many quest drops will drop for each player on the quest.
Not when you're doing the horn hunting.
And sure, people say "that's just the early grind, it only lasts until level 25, that's when you start getting more social stuff."
Yeah. But I'm paying $15 or whatever a month to get to that level. And getting there is godawfully boring. As for playing with more people, well, the community seemed mostly as bad or worse than Xbox Live. Why would I want to team up with any of these people?
I enjoy teamwork most when it's with someone on my couch. Or someone I know personally. I don't look to make relationships over video games and those internet tubes.