I really hope I've not spoiled it a little already: I love RPGs, especially Bioware RPGs, having played through BG2, NWN, ME. The difference with them is that I dived straight in, without knowing anything about the story, characters etc.
BG2 was an amazing experience being my first RPG and going through it learning about the characters, mechanics etc. It really put me in the characters position. It really is great finding a companion, not knowing their personality, class, or even name before meeting them in the game. Don't get me wrong I'm sure I'll love it, it's a small point. I have DAO pre-ordered, but I hope my prior knowledge doesn't sway me too much.