Not that I enjoy piling the dislike on the first novel written in English (actually, that's a lie), but this book is at its best/most useful when it works as an object lesson in novel aesthetics and how what we once appreciated in a book is entirely different from what we currently appreciate.
It's difficult to discuss whether this is a good book or not, given its popularity when it was first published. Yet I found the style of storytelling to be entirely at odds with the conventions I am used to, as though Defoe deliberately set out to spend too much time on the boring bits and downplay the excitement of being shipwrecked on a desert island, surviving and going to battle.
But, as I said, aesthetics.