Are you mainly referring to the graphics here? I mean, for the record, I recently tried Dragon Age: Inquisition's single player campaign (I've beaten both DA:O and DA2) and...the controls are significantly worse than NWN, to be frank. Because the game expects you to control the whole party while having terrible party controls and default companion behavior that might be worse than NWN's all told...
Graphics, too, but I am talking not as much about graphics as about controls and mechanics. DAI is not a very good example of modern controls, since its controls were bombarded by criticism ever since it came out. But, say, soon after playing DAO I've always had a hard time returning to NWN games: the difference was so drastic in everything - combat fluidity, controls, visuals, inventory management, crafting, music and sounds...
NWN2 was much better in this to me personally. Camera there is quite weird, and ugly turn-based combat is still there, but at least controls are fine, you are not stuck controlling only PC, and visuals are good enough for me to feel that I am playing in a real virtual world, not in some set of ugly tiles pretending to be virtual world.
Then, again, my first Bioware RPG was KotoR. I imagine for people growing up on Infinity Engine games NWN graphics and controls might be good. It all depends on the point of reference: what is the threshold for you below which you have a hard time immersing yourself into games.
One thing I'm wondering, given that I'm a noob when it comes to all these technicalities...
Why hasn't NWN graphics been improved as much as some other games with comparable visuals? Take Morrowind, for example.
*video*
I mean, I don't need such graphics. But just... why? Was it impossible to achieve? Or is it that just nobody cared enough?
I might be wrong since I've never really dealt directly with textures and such, but I believe there are some fundamental flows in the engine the game was built around. Texture size is limited in the game, and it is incredibly small by modern standards. For example, the upper dimension of NWN cloak texture is 96 pixels, if I am correct. Modern textures often have resolution 4096x4096 and beyond, so the difference here is 40+ times. When most people have a monitor resolution of, at least, 1920x1080, sometimes higher (I play games in UHD, for example, that is 3840x2160), 96 pixel texture really isn't working well.