indieWIRE's David Ehrlich chimes in with a film reviewer's review of Antkind. It's mega-heavy on the spoilers, though, so be warned. (His verdict, if you don't want to read: he really liked it, with a handful of qualifiers.)

Kaufman’s 720-page Globster of a novel initially feels like it’s trying to split the difference between Haruki Murakami and Hollywood Elsewhere (and later flirts with the likes of Pynchon and Borges on its way toward settling down as an adventure that can only be described as Kaufmanesque). (Source)