^ I think Diagon Alley is a contender for best-looking theme park area ever built (though a large amount of credit goes to the film's art directors). Translating a live-action world to theme parks is straightforward. Disney & Universal have both done it well. Translating an animated or comic book world is more challenging, but both have also done it well, (Fantasyland, Carsland, Seuss Landing, Toon Lagoon).
Nintendoland, to me, appears as a very, very strange translation of Nintendo, looking neither like the 16-bit Nintendo worlds, nor like an inviting and attractive - particularly to a non-fan - place inspired by those worlds.
It looks exactly like the concept art. Actual photos of it look uncannily like concept art. And it seems like some fever dream of weird, jarring enlarged plastic junk from a garage sale stacking up in the kids' toy room. It makes Toy Story Land and DinoRama look like New Orleans Sq and Pandora. I think it's the most aesthetically displeasing area ever built by a major, with the possible exception of the connective areas of Walt Disney Studios Paris.
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So Nintendo Land was wrong-choice design, IMO, but Beijing appears to be lazy, amateur and corner-cutting design (bad rockwork, bad fake palms, terrible sightlines throughout, no WOW factor, cheap ornamentation on the hotels, etc., etc.), which I find ironic given its huge price tag (much more expensive than Shanghai Disneyland or DisneySea). Where did that money go?