
That's where Neverwinter Nights comes in...
...all that classic "single player" goodness crossed with the "massive" (up to 32 or 64, probably 64 at this point, players on a single server) for the end user.
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche