Entertaining but not much new here
Grossman creates a pastiche universe based on comic archetypes to put a modern view on how super folks deal with their superness. This isn't anything new conceptually, and one could argue that there's been a glut of these types of "fairy tales meets modern reality and all of its personal complications" stories out there in recent years.
It is briskly written, and even though the style can be too self-aware and hipster at times, Grossman does have a fondness for the space. It's an amusing, entertaining story for the first 2/3 of the book, particularly when Grossman is playing with his favorite character, the villain, Dr. Impossible.
But the last third of the story, particularly the flat ending, suggests that Grossman would've been better off skipping the typical villain / hero clash as the main driver of the plot. He and the reader have much more fun with the mundane insanity of living in a super-powered world.
