The Greymoor adventure has had some ups and downs. The last commentary here highlighted some of the problems that prevented the introduction from meeting design expectations. Thankfully, there were a lot of impressive ideas that were fully realized in the Markarth DLC, which in some manner compensates for the prior portions of the Greymoor adventure that ended up being disappointing.
Upon comparing previous designs using Dwemer assets, it’s clear that the design team at ZOS has refined their usage of them drastically. Markarth itself looks decent, and the re-imagination of it seems to have (inadvertently) adhered to the criticisms made here; it’s more polished than the original in Skyrim.