I had an absolute blast with so far the first two books. Watts' mastery of psychology & neurosis & suspense is captured in an incredibly tightly confined dark scary isolated space at the bottom of the ocean. The setting here is just so exceeding. What a series (so far).
That's not the grimdark part of the series though.
I do think it a little over reduces the imagery/situation, a bit. Watts' late internet has so many factors of just wrecked savage badlands, being endlessly blasted with savage e-storms. Endless bots screaming, oh yes oh yes, but also just everything under active caustic assault, all pieces of information actively being degraded, constant brownout/black outs, storms & turbulence aplenty. It's wild imagery for a hellacious information space.
Packets are like little programs sent out into the din, trying to make it through the chaos, but being injured mangled warped & hobbled at every step. Picking up all kinds of riders & viruses or just being assaulted & damaged. It's wonderfully terrible imagery.
The second book is Maelstrom, named for this howling shrieking post-internet storm. Book 2, like book 1, has, best I can tell, nothing at all like it in all existence. Amazing grimdark shit.