So far so good. I'm a level 9 control wiz.
Graphics are good, though I find it lags a lot when there are many players around, typically happens in the city. I think it's a memory issue. I only have 4GB of RAM and I notice the HDD is swapping a lot, so that's the cause. Maybe they could optimize memory usage better.
The game is fun, quests are interesting and you feel like you're having an actual impact on the story and environment. Unlike GW2 for example, quests do not involve having snowball fights, gathering beer kegs. Also you can progress from quest to quest without worrying about leveling up. Whereas in GW2 they forced you to take breaks from the main quest in order to level up. That wouldn't have been so annoying had the side quests been somewhat interesting. But they weren't and that made GW2 super boring. No such problem with NW so far. It's fast paced. There seem to be a lot of skills and different ways to progress, but I really haven't gotten too far into that.