Yeah, as far as the first Dune went, the casting was easily the worst thing about it. Isaac was at least decent, but the rest of the cast varied wildly from somewhat competent to "what were they thinking?!" I suppose that Chalamet has grown on me as Paul, but my general feeling is that they spent a huge amount of money hiring big name actors when they could have gotten better performances from some lesser-known actors and not wasted as much on actor salaries. Other than that, the world of Dune is just as fantastic as it was when I was first introduced to it in high school. No performance is so bad that it actively makes for a worse movie - I quite liked the first Dune movie (The 2021 one). Big miss on a lot of the casting though in my opinion.