Here's a test that has been around since MUD's but applies to MMO's as well. What kind of online player are you? Achiever, Explorer, Killer, or Socializer?
Bartle Test of Gamer Psychology | gamerDNA
This time I came up as
In the past my socializer stat has been higher than my achiever stat, but this time they're tied. I guess I'm becoming more type-A or something.