I believe that Planescape: Torment is the only must-play Infinity Engine game. Neither Icewind Dale nor Baldur's Gate can compete with it as far as the story and narration are concerned. I wouldn't play any RPG just for combat and or dungeon crawling. Icewind Dale isn't really my cup of tea and Baldur's Gate just doesn't have that feel that what you do is important. It's pretty much a hack and slash with a decent story attached to it. Torment can be a hack and slash game if you want, but you may also hardly be required to fight should you rely heavily on dialogues.
