Okay, sure, this is the first HPLovecraft I have ever read, and I had no idea what to expect, but really, a pilot and a geologist stumble into a strange 500 million year old cave with a series of carvings and suddenly know an entire culture's history?
Let's just skip the story set up and just go straight to the Old Ones history, instead, shall we?
Okay, having never read Lovecraft, I had no idea what to expect. I enjoyed the history lesson, though seriously doubted one could come up with such an elaborately detailed history by walking through hallways adorned with statues and frescoes for a couple hours. That part was a little absurd. Okay, a lot absurd.
The full text is available online. It's a quick read if you're curious about Lovecraft. Having not read anything else by him, I am unable to compare this to his other works. This one was fine for me.