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Accumula Town, Striaton, and Nacrene were spot on with what Unova was trying to do, Castelia was probably the best it could've been, but it's still lacking something in my opinion, probably just a little more in terms of exploration.
The new towns and areas in B2W2 felt pretty good though, especially Virbank. And it did add some more stuff to explore in Castelia, which is cool.
With how Kalos and Alola captured the places they're based on, it makes me wonder what GameFreak changed internally in terms of region design between B/W and the next games they worked on.