This seems to be the novel where DeLillo finally wrote the type of work using his full capacity. It's certainly in his top-tier, even though I had to re-read many pages just to get through it. DeLillo basically gave the novel its own language and form to understand itself, and you might, miiiight "get it" by the end. It is probably better the second time around, which is equally fulfilling and annoying since there are so many good novels to get through.

DeLillo describes the book (and his career) pretty well about 3/4 through, when he gives a write-up on a fictional Nobel Prize in Literature winner (it could also apply to Thomas Ruggles Pynchon):

“recognition of a near century of epic, piquant disquisitions on the philosophy of logic, the logic of games, the gamesmanship of fiction and prehistory, these early efforts preparing the way for speculative meditations on the ‘unsolvable knot’ of science and mysticism, which in turn led to his famous ‘afterthoughts’ on the ethereally select realms of abstract mathematics and the more palpable subheights of history and biography, every published work of this humanist and polymath reflective of an incessant concern for man’s standing in the biosphere and hand-blocked in a style best characterized as undiscourageably diffuse.”