I'm an ISTJ and I've always loved RPGs. I mostly play the console-styled ones, such as Final Fantasy and others. I also played Guild Wars for four years. (Still playing.)
I would love to play more on-paper or table-top strategy, but none of my friends would play those with me. That's why I never invested in them. (Although I did create a D&D styled game myself, using Lego characters for the movers and I drew up my own character sheets, cards, and other stuff. Rules, just with dice and ruler, etc.)
The primary attraction for me in an RPG is the story --- that is a must. But other than the story, I enjoy the problem solving aspects. I like it when you are handed a quest and there is more than one way to solve it, etc. Linear is nice, storyline-wise, but I really like games that are open-ended, like Oblivion and Fallout 3.
Heh....I even tried making an RPG out of a short book I wrote, once. RPGMaker XP. ; )
(Got halfway done with it, but once I realized that no one would play it, I quit. It was only fun for sixty hours of work or so. After that it was just.....work.)
Long live RPGs!