There's a deep insight in there; both the concept of financial fragility and his insight, way ahead of anyone else, that as the memory of the Depression faded the system was in fact becoming more fragile. But that insight takes up part of Chapter 9. The rest is a long slog through turgid writing, Kaleckian income distribution theory (which I don't think has anything to do with the fundamental point), and more.

Or maybe it was just that a lot of stuff in the book was known to him from other sources and new to me when I read it...

Economics is politics by other means