I think all the good ones have been mentined. And i agree. But i have to say that Diablo1+2 are more hack and slash then a RPG. Baldur's gate1+2 and there add-ons are defently worth it. Actually most of the best rpgs are from Black isle and interplay. I recently finished fallout1 and i've nearly finished fallout2 there also worth bying.

Joliekiller, paladin on a crusade against (almost) all evil.