It released in 2002. That's early age 3D.nwn was not 'early age 3D'
Anything 95 to 05 is in that field of games that had mostly terrible looking 3D (especially in that 00 to 05 area) because people pushed for techniques (like reflection, bloom, etc.) without understanding what to use them for while simultaneously being limited by how many polys can be put on screen at the same time.
Sure, there are some exceptions from that time, 3D games that still managed to look decent despite low poly 3D.
But they all had really ugly stuff in them. Like Morrowind, generally good atmosphere and world art, but dear lord are those models and animations terrible.
Or games that understood the limitations and did the best within. Like Blade Of Darkness that I'm currently playing - ugly, sure, but not offensively ugly like NWN.
NWN just sticks out even more because almost nothing in that game looks good.
It's at the bottom of the scale, but it's still a scale of shit.