Recs.
Updated
Planescape: Torment is a CRPG (Computer Role Playing Game) that focuses heavily on storyline and conversation over combat and strategy.
Specs
Pros
Pro The best story in the genre bar none
A mature story that doesn't rely on cheap "dark" content. Few characters are just one-sided caricatures, instead they feel human and realistic. The writing is very good. Also instead of the standard "save the world" stuff, you're an amnesiac immortal that goes in an intensely personal journey of discovery and understanding that finishes in you figuring out why are you immortal, and ending that immortality.
Pro A dark, engaging setting
Planetscape: Torment has a dark setting where zombies and scary creatures are the focus, making for a game that is themed to be more scary over a traditional fantasy game. So for those interested in a darker themed fantasy setting this should appeal to their interests.
Cons
Con Traditional fantasy fans may find the game daunting or too dark
Unlike most CRPG games the fantasy setting is not very Tolkeinesque, there are no dwarves or elves to be seen. All of the traditional fantasy tropes will not be found here as the game focuses on a much darker setting with undead and other scarier creatures. This may not be intriguing to some and too dark a game for those that normally enjoy the CRPG genre.