Matthew Specktor really likes it:

It must be said that, by any standard — and even for someone who remembers the shock of Kaufman’s work when it was passed around Hollywood as unproduced samizdat in the 1990s — “Antkind” is an exceptionally strange book. It is also an exceptionally good one, and though one is tempted to reach for the roster of comparably gnostic novels by contemporary (-ish) writers — not just Wallace, but Pynchon, obviously; John Barth; Joshua Cohen, perhaps — such comparisons inevitably collapse. (Source)