Originally Posted by Ergonpandilus 
Some would say that Planescape Torment is an true RPG, but IMO it's more like adventure with lot of dialog.
It's just that the aspects beyond writing and NPC interaction (combat, exploration, character building, etc.) are so mediocre they're completely overshadowed by the story and the whole experience ends up feeling more like a gamebook. It's comparable to Temple of Elemental Evil: a game that does one element very well indeed, but the rest is entirely forgettable.