I would say NWN feels more RPG-like to me probably because of the number of side quests, the the less frantic combat, and the greater number of interactions with different NPCs. Sure the dialog isn't great but the quests at least keep me interested for the most part. D2 is more like an arcade game to me. It has character/stat development but the pace of combat is very fast and can't be paused and the number of side quests isn't as great and they are far more linear. I feel like I have more freedom to wander and complete quests in whatever order I decide in NWN. Don't get me wrong I played a lot of D2 and liked it just NWN seems to be deeper to me.