EQ2: Obelisk of lost souls (did you know it goes down very deep and the few nameds at the bottom didn't drop shit?), the beehive in Enchanted Lands (Rivervale) where there was absolutely no loot and there were two possible events that didn't work or bugged out, and many many more places I could add to the list, like Silent City and its neighbour area, egyptian underground cities, used mostly to grind shit for the peacock line quest, but not much more, were in my opinion underused and possibly subject to an old school design (is there anything interesting spawning here? you won't know if you don't camp it for hours, cheers!).
Then we got Unrest, the EQ2 version: brilliant, fun, challenging with a storyline akin to the old Netropos Castle design (great zone that one).