China Miéville, like J.G. Ballard and William Gibson before him, was interesting and different enough that people thought he and those resembling him deserved a new subgenre name: in his case, the New Weird. Here is a history of it.
There are a couple of items that seem newer to the author of the article than to me. I do not find it unusual that a new movement name inspires three reactions: (1) This is not a movement but divers writers by violence yoked together. (2) This is a movement, and it’s the best thing since sliced bread. (3) This is a movement, and it’s a threat to our natural bodily fluids. Also, fantasy that thinks like science fiction may be weird, but it wasn’t new. It was the basis of a successful and beloved magazine: Unknown.
Thanx to Metafilter