I can't put my finger on it, but I had a hard time getting my mind into this story. I've enjoyed most of Lovecraft's works, but this feels, I dunno, different. I probably could have skipped this without missing any real meat of the Lovecraft mythos.
The unspecified nature of the (presumably global) catastrophe coupled with the very scant details of the pre-collapse world lends this book durability. The author presented his world in such a way as to make me wish we could explore it.
However, the extreme detail often appears to overshadow the actual story. Much of the book appears to be setup for a story that doesn't really begin to flesh out until quite near the end. At which point, the hero walks into the sunset, leaving practically all the issues unresolved.
I imagine this abrupt ending was deliberate, adding to the timelessness of the story, but even so, the book leaves the reader in the lurch.
Nevertheless, reading this was not a waste of time.