Hate to burst your bubble, but Baldur's Gate 2 was two-dimensional, not three. =>_>= Plus, the creatures in there were no less cartoony than those in NWN, since they were simply sprites. It lacked much of an all-enveloping environment due to the lack in the graphics department. However, its only redeeming quality really was the great storyline. I'd like to see something more of that in NWN2, but please, no more deities meddling amongst mortals or family members in need of rescue. In Baldur's Gate 2, they pretty much wrote the biography of your character for you, taking away from the feel of uniqueness one would want to feel from playing a character of their own creation
The combat system wasn't bad either, but nothing that I would look forward in seeing in NWN2.