One of the best dungeons I'd say was Sacrarium. The fact that the maze layout changed depending on time of day as well as the day was just...exactly what a dungeon should be like, and it was open world. I don't get what's wrong with open world content and why things HAVE to be instanced.

I mean, is seeing other people exploring and fighting in a dungeon that big of a deal to MMO gamers? What happened to this genre?