Yes, I find the lack of ... unique stuff, upsetting in NWN. A nice example of what was lost would be the planar sphere from BG II, sitting in the middle of town, complete with a wholly unique interior.
I personally think that Bioware should have added in a lot more objects to play with, but if you consider how NWN is editable in ways that BG II simply was not, it's an understandable loss.
I understand from a poll on the Bioware site that they're considering releasing CDs periodically with more content, including perhaps short dungeons, more monsters, more tilesets etc.
From my memory of DS, there weren't that many more / different location types than exist in NWN. Off the top of my head, there was Snowy mountains, forest x2, snowy caves, desert + desert mountains, coastline, castle and a few indoor sets.
It's not significantly more extensive than NWN imo, it just feels that way because things aren't so square.
I think however, you'll find much more online content for NWN, and the combat *is* much deeper than that offered by DS. Even if I were comparing based solely on the satisfaction that a fighter type could have in combat only, NWN would win.
you can also set up NWN with a lot more types of combat - DS was typically limited to crushing groups of similar enemies, and had only one or two bosses to speak of. In NWN you could set up hordes of monsters, but you also have a greater choice in fighting a single overwhelmingly powerful enemy, which I would say was more satisfying.