For me it's not the size that bothers me, but that everything looks the same not just the dungeons. Once you've seen one, you've seen them all.

But if you consider how many people are working on this game and how big it is, it's understandable. The devil is in the details. And I don't mean that details make things better, that's for sure, but that there is often a lot of work behind it.
Even big game-title struggle with this.

I hope that there will more diversity come later. But the whole game needs diversity in the optical sense, in my eyes.