What is fun to you in an MMO?

[Denmo]

Rated from highest enjoyment to lowest

1. Accomplishment via strong teamwork, good playing skills, and comradery
2. Engaging in general japery
3. Being apart of and having an impact on the game's world (and not just what I see)
4. Exploration
5. Helping others
6. Growing stronger

And a twist, things I hate about MMOs:

1. Players who place themselves above others, for whatever reason.
2. The grind
3. Exploitation/bots/gilsellers/RMT
5. Accomplishing things where no real skill/teamwork was needed.

Unless it's a designated PvP thing, there's no need to turn an MMO into a competition. Too often I see E-Peen contests in MMO's, and it drives me batty.