At this point, if the third dungeon in each patch cycle was sacrificed for the development of "new systems" such as diadem, verminion, and PotD, I'd really like those new systems to be fun, interesting, complete, and fulfilling at launch. Diadem launched last November and died very quickly; the apologists for it tell us that it was just the framework for something amazing that will come out a year later. PotD has similarly been defended with its barebones box-room design (it really is as basic as one can get when it comes to designing random dungeon content) with the promise that it will be amazing when it is patched, whenever that might be. I don't think those arguments excuse underwhelming content being released. And even if they did, we had Nyzul Isle ten years ago, so why exactly is PotD so lackluster?