Basically, I think I am, according to the classification scheme devised by "Patriarch917" of the RPG blog lolforinitiative:
lol for initiative: The Lawful Good Dungeon Master
If you’re a Lawful Good Dungeon Master, you respect the authority of the rules of the game, and you believe that those rules are the best way of achieving your goals. You know that fair application of the rules promotes a sense of objectivity, and you want your players to know that you are objective. Your players know that if you tell them the Owlbear made a critical hit, the Owlbear made a critical hit. They know it because of the 20 staring up at them.
See also the Good Dungeon Master.
Important points are that I don’t view DMing as a contest between me and the players, and that I actually do try to apply the rules openly and fairly. World Builder and Facilitator are both roles that I am comfortable with and pretty much the goals of my DMing.