What kind of gamer are you? Rules Lawyer, Munchkin/Power Gamer,Lurker, Storyteller/Method Actor, or something else? (Search "types of gamer" for more ideas!) How does this affect the kinds of games you play? For example, maybe you prefer crunchy rules-heavy systems to more theatrical rules-light ones.
Role-Player not Roll-Player with a nice side of Storyteller. I am into story and theatrical combat. I try to bring what my friends call the 'awesome'. Christian's daughters rightly capture my play-style by shouting "Boom!" at the table.
I think Ryan Macklin does a good job of pointing out that this prompt "It's a trap!". I feel like all of these lavels for types of gamer apply to me depending on the game. sometimes more than 1 label at a time.
I enjoy mastering the rules for my PC when playing D&D so crunchy rules/Rules lawyer. But when I run D&D I care more about facilitating fun for everyone else and don't let things like rules get in the way of everyone's fun.
In Savage Worlds the rules are so simple that I find myself lurking in most games and occasionally trying to play the 'troublemaker'.
For Do it's a storytelling game so it's all about telling silly stories for me.
In the big picture I would say that the rules of a game and its themes will dictate my play style.