Sax Rohmer created the famous Fu Manchu series. His breathless purple prose about the Yellow Peril tapped into the fear, prejudices, and stereotypes of his era, so that very little else was really needed to create an exciting story. And, since each book, was one in a series, crisp endings didn't matter all that much. Each story was expected to pave the way for the next.
So, if you strip off the racial stereotypes and prejudices, there wasn't really much left to distinguish the story. That becomes apparent in this book. It recycles the evil super-scientist bent on world domination (destruction in this case), the sweet young thing dragged, against her will, into the plot, and dashing good guys who save the world with just moments to spare. You know, the usual.
If shallow characters, unexplained situations, and abrupt endings suit your idea of a story, have a blast. This is pulp fiction at its pulpiest, with all the good and bad that implies.