The engine is clearly the best tool ever released for creating radically divergent CRPG mods -- It literally made Purgatorio possible
Without it, Purgatorio would just be a glimmer in my evil, twitching eye.
As for the fanboy accusation... guilty as charged!
I found a Planescape box set on a shelf near my office with Chris Avellone's name in it and a bunch of stuff underlined and notes in the margins and whatnot. I think its a copy from the Interplay days when Torment was being made. Surreal lol.