I found it interesting from an historical perspective—dipping into the most famous of the pulp fiction series from the 1930's. And it wasn't as badly written as I expected, although the prose was decidedly purple. For example: Some blocks away, the skyscraper under construction loomed a darksome pile, crowned with a spidery labyrinth of steel girders. Only the vaguest outlines of it were discernible. Impossible, of course, to glimpse the strange, crimson-fingered servant of death in that wilderness of metal!

Doc is impossible skilled, knowledgeable, insightful, and powerful. None of the characters are developed at all, so there's not really anybody to root for. It's just wild, rushing, non-stop adventure with cliff-hangers galore.