PCs have a different style of RPGs; Black Ise games, Morrowind, MMORPGs
Oh, and most console->PC ports suck, because the PC audiance has been weened on and enjoys a different kind of gaming experiance.
For example; Metal Gear Solid (very good game) vs. Ghost Recon, Metal Gear is more science fiction, has a good story but the gameplay is not the style I enjoy, on the other hand, Ghost Recon has the realism and awsome gameplay (be it a diferent/better type)
Anyways, why do PC rpg suck?
Final Fantasy is fine, massive, exhilarating... but compared to making your own party and kickin ass D&D style in Baldur's.
You just can't compare the two, its almost like a different genre.