I would end up writing what you felt like was a book, if I meant to answer earnestly about the ways each book singularly impresses me, which I would have to do since the only thing they have in common is "epic/narrative poetry" (4/5), or "religious stories" (5/5), when those don't exactly hit on its personally-appreciable aspect. So, I'll just write something nice about one book, and very nearly the lowest ranked, the FOURTH book, and see if you don't get tired 😭
So, to say what I like about Ovid's book.... the Metamorphoses is really very unique among all books I've read. Aside from it being just about the last, plus most comprehensive, "primary" source for our knowledge about the ancient Greek cultures, their gods, and their histories; it is also an absolute masterpiece of storytelling, accumulating dozens and dozens of the ancient stories that comprised the tapestry of the Hellenic Greek culture (although with name changes as it was later adopted by the Romans, and thus Ovid), and managing to fashion them in a fairly unified narrative format (remember, they were all separate stories, from the stories of the founding of Thebes, to the abduction of Persephone, to the exploits of Hercules) that always features some kind of transformation (thus, Metamorphoses) but also cleverly morphs the ending of the last myth into the introduction of the next myth by even the tiniest shared feature or detail. It often happens so subtly it felt like a dream, where you didn't even realize that the scenery was changing until you realized you were in an entirely new location.
The book has taught me the origins of many words I knew, because the stories were themselves responsible for the very invention of those words! Lycanthropy, for the story of Zeus transforming Lycaon into a wolf (Lycaon + anthropos [Greek for Man]); Arachnid for the story of Athena transforming Arachne into a spider as the wager that she was the best weaver in all of the lands, better even than the gods (she was not 😂); Hermaphrodite for the story of Hermes and Aphrodite having a child, Hermaphroditos, so beautiful that the naiad Salmacis tried to rape him, and failing that, wanting to be with him so desperately, she even prayed to be united to him forever, and so one of the gods answering that prayer transformed the two of them into one, a boy-girl made from the son of the gods and a kinky female spirit 😳
I could go on but honestly, it's way more than enough. These books are not for everyone, but to whoever can, they're extremely rich and are basically foundational literature whose only barrier for appreciation is perhaps knowledge, willingness, or understanding; but certainly not technical ability, quality, or creative invention.
I'm sorry for abusing you if you read all of this.