Maybe i did not find a good city for dungeoneering, but i found like 1 or 2 dungeon like POIs so far that i looted... I don't count the big hotel (which I KNOW is a dungeon POI), a Theater, Shotgun Messiah factory and some Oil factory (they look big enough to be dungeonesque). All the smaller, house like POIs have been more or less easy entry with loot splattered all over the place like the specks of blood when hitting Zs.
This is refreshing to a point, although i'm gonna start looting the big ones soon and get back on my feels then.