Can't agree with this enough. Baldur's Gate was "meh" for me, but Planescape Torment really hit the spot.
PS:T is my favorite cRPG to date with some of the very best writing that can be found in games. It features an interesting and thoughtful narrative but above that it has great characters with deep and meaningful dialogue trees that feel organic to the story that unfolds before the player.
Unlike you, Kotarone, I rather liked the Baldur Gate saga as well. It is true that its plot was not nearly as interesting as Torment - I have a number of reservations about the Forgotten Realms setting - however, BioWare did well with providing diverting NPCs and building up the scope and variety of gameplay as the series progressed. In Baldur's Gate II (Shadows of Amn) NPC interaction, character customization, and combat tactics all took a step forward from the original game. It is perhaps unfortunate that, due to a variety of factors, BioWare rushed out the conclusion to the series. Had they taken the time to improve its scope and properly pace it, Throne of Bhaal could have been a truly epic climax.
I know not what life is, nor death.
Year in year out-all but a dream.
Both Heaven and Hell are left behind;
I stand in the moonlit dawn,
Free from clouds of attachment.