I gotta say that I'm none of those. i'm more hardcore gamer than casual, but I don't need to be the best at any game I play, even though i will still play seriously, plus I know it's all in good fun and don't take anything involved in gaming personal. I don't really plan out ways to do things, but I'm also not a guns blazing type of player. I enjoy games like Mass Effect and Fallout, but I will never 100% one of those games, still, I also won't just do the bare minimum.
If I had to classify myself as a gamer, I would call myself a "gamers gamer", in that i want every single person i'm playing with to have the same fun experience that i am. i will give tips if I see someone struggling, I never team kill or glitch, unless it's a group effort and no one gets a short end for it. To go so far as to be a little bit blasphemous, I'd say that I'm like the Mother Teresa of video games, only I'm a dude.