I guess the perfect game for me would an hybrid between a RPG and a 4X game. The game closer to that spirit (but that was still quite far from it) was the original Dune game. Some NWN (1 and 2) modules also had a bit of that spirit, even if the "4X" part was very minimal.

Somewhat a mix between MoM/WoM and Baldur's Gate/NWN/Torment. A game where you play the role of a prince/king or maybe an immortal being (vampire, angel, dragon, robot, whatever) and in which you can both directly interact with the world (doing quests personnally or with a few friends, meeting people, negociating agrements, ...) and you command a small but growing empire/kingdom/... and you can recruit generals, train troops, employ people to do scientific or magical research, build your cities, ...