Planescape: Torment. That thing consumes hours like average slobs devour cheeseburgers in McDonalds.
Why? The story. Whoa, it expands quite a lot as you start finding out things someone has done… and that’s YOU… And you happen to be… immortal. And for some minor amnesia related thing, you can’t fricking remember your name or what you are. Well, time to find out!
And you can do it all the way YOU want. Is that old granny in the house annoying and you want better refund for the priceless artifact you brought her? LIE! Spooky ghost claims to be your deceased fiance and she wants you back? FAKE VOW >:)
…or you could go for the goodie-twoshoes way. Blah. All moral decisions affect your alignment…
And the cast of characters… A floating skull… an old man with a problems knowing himself… Tiefling Chick… a succubus with a brothel… (which strives to pleasure the mind, not the body) a suit of armor that keeps itself together with a strong sense of justice…
…and more…
Why not? I’m poor at describing things in an adequate way and this text seems boring.