Or how about rather than more "dungeon" fights, have more fights take place inside buildings? It's not "open field" fighting, but it's still very intriguing nonetheless. There is less room for manuevering around, but there is more potential for storyline. I really loved fighting those guys in the house where the little boy's parents were being held hostage. It was a great quest, and I wouldn't mind seeing some fights taking place in large mansions as well. Tying those mansions in Verdisidis, and the drudgery of nobles that reside within them, to some larger, more insidious quest would have been interesting to see in DD. Some men jumping out at you as soon as you open a door would be cool, too. of course, this might not work since in the in-game map you can see where the enemies are. But nonetheless I think a good game should have a balance of "city fights" and "dungeon crawls."
