> When asking this question elsewhere, [the staggering breadth of scope which RPGs offer](http://meta.rpg.stackexchange.com/q/1475/4398) may be a stumbling block for such an open-ended survey.
The qualities you've described are common to a prominent subset of the RPG medium, but there's a great many RPGs which offer an utterly different experience. Describing your goal (a truly generic system adaptable to all possible play styles? a refined D&D-like system which offers up the play experience you like best? etc) will go a long way to get getting useful responses.