I am a 360 girl. I have owned PS3s, but I just could not get into them for some reason.. This may just relate back to the fact that I had my 360 first, so that immediately became my "baby."
I suppose I do fit into this guy's stereotype because I don't care too much about the art of the game. However, I don't fit yours. I play significantly more single player games/spend more time on campaigns that I do in multiplayer matches. I definitely do play the multiplayer modes on most games, but not all that often. I mostly play games to relax and I find multiplayer usually leaves me feeling a bit high strung.
My boyfriend fits into his stereotype though, as do most of his friends. They are graphics snobs and won't typically play games that look to kiddish or outdated.
Now, as far as PC goes... I almost exclusively use it for multiplayer gaming.