The best of Nuka World is the theme park when you first go to the locations.
I think after visiting this "magician ghoul" (the first location I visited) and finding that whole location just stupid, boring and badly written,
not entertaining I read up on the wiki to see what the other locations had to offer (Gator Claws?!). I than quit Nuka World and never looked back. No wrong, it was the point were I uninstalled F4.
To be honest, the intro, the first dialogues and interaction with the Raider Leaders, the premise got me slightly excited, at that point I was 10-15 hours in the "main game" and wanted to uninstall it, so I gave Nuka World a try).
There are good parts in F4, but not many, or enough to make it for me a decent or even enjoyable game.