Spent some time with NWN online over the weekend. I felt the game had a good D&D feel to it. The combat is fun at first, but feels sorta of herky-jerky at this point in development. I am not sure if its the animations or the fact that they decided to root players to the floor on hits. There is certainly a delay on using a dodge that they should remove. Attacks are responsive, but dodges aren't as responsive.
I only made it to level 6. Early on, its a pretty linear, quest driven game. I had like one or two quests at a time at most, and they mostly revolved around the early story. Grab quest, go to instance dungeon-like area and pound through mobs. I like the little things in dungeons you can research according to your class' specialty. It's just more of a button pressing thing, but I do enjoy looking around areas for more stuff to investigate.
It feels sorta diablo-ish at times, at least in the way mobs die and loot pops out, and the fact you take on multiple mobs. A lot like Vindictus in that manner, but the combat is more like a limited version of GW2 combat.