In my opinion, the only thing good that came from that book was this one quote from Satan.
All is not lost; the unconquerable will,
And study of revenge. immortal hate.
And courage never to submit or yield:
And what is else not to be overcome?
I personally haven't finished it but I shall say the illustrations are beautiful. Most people have mentioned that Satan is the most interesting character in that book, while the fart in the sky is ultimately dull, and boring so that's a plus in a sense.
Also, Paradise Lost has spawned garbage like the music video White Flag by Delta Heavy:https://www.youtube.com/watch?v=ebILIKHi9wo
Which really only furthers the Xian stereotype of things.