I'm a big fan of the Avery Cates series. They are fun, energetic, and filled with a cinematic quality that really drives the cyberpunk dystopia.
Avery usually slogs along on missions, largely against his will, and defeats his enemies by being skilled, smart, but mostly superhumanly tough. He routinely gets beaten up and then, summoning his last ounce of strength, manages to defeat his opponent. He is clever, likeable, and fun to read.
This particular novel, however, was quite disappointing. It still delivers the setting and Avery's character, the usual fights and chases, but this time Avery doesn't even care about his mission. Avery doesn't care about the other two characters he interacts with for most of the novel. Avery is just kind of stumbing along getting beaten up and dodging bullets.
As for the plot, nothing much really happens in The Terminal State except getting everything ready for another book. In fact, I think the next book should start, "I told you that story so I can tell you this one..."