I don't know, I felt a little upset when I found that most of the music and character sounds are the exact same ones from NWN1. It would have been a nice nostalgic feeling if it was just one or two tracks, or if the music was remixed or something, but now it just feels like a total cheap move. I love the main title music, and I wish all the other music fit in with it in terms of quality and style. A lot of the game felt kinda ripped off from the original, which was a little disappointing rather than reminiscent.
It seems to me that a lot of the features of NWN2 are a result of lazy design.. For example the inventory, from the interface to the actual objects, everything about it just comes off like they were too lazy to make proper items with matching icons.
As far as I'm concerned the only improvement in NWN2 was visual. It's clearly better looking than NWN1, just not good looking enough for how it performs. When it comes to content I'm still annoyed at how lacking (and ugly) the character creation options are. The main campaign and storyline are decent, but somehow it doesn't feel quite as rich or captivating as any of the NWN1 campaigns. Sure it has some new great features, but I just felt it wasn't quite as good as the original. Don't get me wrong, the storyline is great, just not quite as great as NWN1. That's exactly how I felt about KotOR2 versus KotOR1.
So far, based on everything I've seen from Obsidian, I get the impression that they're kinda lazy, clumsy developers. Of course I'm comparing them to BioWare, who are quite diligent to begin with.