I've been playing Neverwinter Nights since Sunday and it's well worth the wait. The plot is solid so far (I've played through the first chapter), although not quite as engrossing as Baldur's Gate II. Some of the dialogue leaves a little to be desired but most of the voice acting is good. The combat animations are excellent.

There seems to be a lot of buzz in the community about building old D&D adventure classics for NWN, which is going to lead to some interesting copyright issues.