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Ryzom gets the recommendation from Massively for it's RP attributes:
What we're not doing
There is a game out there that really does care about roleplayers and care about allowing people to RP in an enjoyable environment. That game is Ryzom. It features some stunning graphics despite its age, a very open character progression system, and about seven players.
I'm being hyperbolic, of course -- the actual number is around nine -- but the point should be there. Despite the fact that the game explicitly advertises itself to fans of roleplaying, it's attracted only a very small playerbase. The saga of management mishaps hasn't helped it, to be sure, but there's also the fact that it seems targeting stuff to roleplayers simply doesn't work. We hear about it, and then we just sort of ignore what we're being sold and go back to the game that doesn't look twice in our direction...