Allow me to refine your types a bit:

1. The Gamer. To them D&D is just a game like a board game or a video game. They feel that as a player they must absolute know all the rules of the game, before it starts. If they must ''role play out'' something in the game they will pretend like the character does not know everything, but the player must know everything at all times.

2.The Unique Experience. A role playing game is like not other activity. Period. It is a way for a group of people to create and interact with a shared alternate reality. In this game, the players are as clueless as the characters.

3. The buddy. Just there to fill up a couple hours...

I'm a Unique Experience type.